Source: US. Bureau of Labor Statistics
Release: Consumer Price Index
US. Bureau of Labor Statistics, Consumer Price Index for All Urban Consumers: Transportation commodities less motor fuel in Midwest - Size Class A (over 1,500,000 persons) [CUUSA200SATCLTB], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/CUUSA200SATCLTB/, September 2, 2015.