Source: U.S. Bureau of Economic Analysis
Release: Gross Domestic Product
BEA Account Code: B4510C
For more information about this series, please see http://www.bea.gov/national/."
U.S. Bureau of Economic Analysis, Self-employed persons: Transportation and public utilities [B4510C0A173NBEA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/B4510C0A173NBEA, March 20, 2018.