Source: U.S. Bureau of Economic Analysis
Release: Gross Domestic Product
BEA Account Code: B235RC
For more information about this series, please see http://www.bea.gov/national/."
U.S. Bureau of Economic Analysis, Federal government current tax receipts: Taxes on production and imports: Customs duties [B235RC1A027NBEA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/B235RC1A027NBEA, March 19, 2018.