Industry based on 2002 North American Industry Classification System (NAICS). Please consult the U.S. Census Bureau (http://www.census.gov/epcd/naics02/naicod02.htm) for additional information about NAICS.
Source: US. Bureau of Labor Statistics
US. Bureau of Labor Statistics, All Employees: Trade, Transportation, and Utilities in Illinois [ILTRADN], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/ILTRADN/, July 4, 2015.