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 Economic Analysis
Release: State Personal Income (Quarterly)
US. Bureau of Economic Analysis, Utilities Earnings in Oklahoma [OKEUTI], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/OKEUTI/, July 7, 2015.