Source: US. Bureau of Economic Analysis
Release: State Personal Income (Quarterly)
Please visit http://research.stlouisfed.org/fred2/personalincome for documentation on the derivation of personal income.
US. Bureau of Economic Analysis, Personal Contributions for Social Insurance in Illinois [ILOSOC], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/ILOSOC, December 4, 2016.