Source: US. Bureau of Labor Statistics
Release: Consumer Price Index
US. Bureau of Labor Statistics, Consumer Price Index for All Urban Consumers: Energy services in West - Size Class B/C (between 50,000 and 1,500,000 persons) [CUURX400SEHF], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CUURX400SEHF, September 24, 2016.