Source: U.S. Bureau of Economic Analysis
Release: Gross Domestic Product
BEA Account Code: CON520
For more information about this series, please see http://www.bea.gov/national/."
U.S. Bureau of Economic Analysis, Contributions for government social insurance: Employee and self-employed contributions: Federal social insurance funds: Old-age, survivors, disability, and hospital insurance: Self-employed [CON5201A027NBEA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CON5201A027NBEA, March 23, 2018.