Source: US. Bureau of Economic Analysis
Release: Gross Domestic Product
BEA Account Code: B104RC1
A Guide to the National Income and Product Accounts of the United States (NIPA) - (http://www.bea.gov/national/pdf/nipaguid.pdf)
US. Bureau of Economic Analysis, State and Local Government Receipts: Contributions for Social Insurance [ASLRSI], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/ASLRSI, December 3, 2016.