Source: US. Bureau of Labor Statistics
Release: Consumer Price Index
US. Bureau of Labor Statistics, Consumer Price Index for All Urban Consumers: Utility (piped) gas service in South - Size Class a (over 1,500,000 persons) [CUUSA300SEHF02], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CUUSA300SEHF02, December 9, 2016.