Federal Reserve Economic Data: Your trusted data source since 1991

  • Ratio, Annual, Not Seasonally Adjusted 1951 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1951 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1952 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Millions of Dollars, Annual, Not Seasonally Adjusted 1952 to 2022 (Oct 26)

    BEA Account Code: B4085C For more information about this series, please see http://www.bea.gov/national/.

  • Millions of Dollars, Annual, Not Seasonally Adjusted 1952 to 2022 (Oct 26)

    BEA Account Code: B4084C For more information about this series, please see http://www.bea.gov/national/.

  • Ratio, Annual, Not Seasonally Adjusted 1953 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1953 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1954 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1954 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1954 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1955 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1955 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1959 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Millions of Dollars, Annual, Not Seasonally Adjusted 1959 to 2016 (2017-08-04)

    This series has been discontinued and will no longer be updated. It was a duplicate of the following series, which will continue to be updated: https://fred.stlouisfed.org/series/B4188C1A027NBEA BEA Account Code: B4188C0 For more information about this series, please see http://www.bea.gov/national/.

  • Millions of Dollars, Annual, Not Seasonally Adjusted 1959 to 2016 (2017-08-04)

    This series has been discontinued and will no longer be updated. It was a duplicate of the following series, which will continue to be updated: https://fred.stlouisfed.org/series/B4189C1A027NBEA BEA Account Code: B4189C0 For more information about this series, please see http://www.bea.gov/national/.

  • Index 2017=100, Annual, Not Seasonally Adjusted 1959 to 2023 (Jan 25)

    BEA Account Code: DPWCRA For more information about this series, please see http://www.bea.gov/national/.

  • Index 2017=100, Annual, Not Seasonally Adjusted 1959 to 2023 (Mar 28)

    BEA Account Code: DPWCRG For more information about this series, please see http://www.bea.gov/national/.

  • Billions of Dollars, Annual, Not Seasonally Adjusted 1959 to 2023 (Mar 28)

    BEA Account Code: DPWCRC For more information about this series, please see http://www.bea.gov/national/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1960 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1969 to 2019 (2021-02-05)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-02-05)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2011 (2013-08-12)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.

  • Ratio, Annual, Not Seasonally Adjusted 1970 to 2019 (2021-01-21)

    Source ID: labsh When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table" American Economic Review, 105(10), 3150-3182, available for download at www.ggdc.net/pwt For more information, see http://www.rug.nl/research/ggdc/data/pwt/.


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