For the 12 month period ending December 2009, the Consumer Price Index for All Urban Consumers (CPI-U) rose 2.7 percent, compared to 0.1 percent for 2008. The larger increase was primarily due to the energy index, which rose 18.2 percent during 2009 after falling 21.3 percent in 2008; in particular the gas index, which rose 53.5 percent in 2009 after declining 43.1 percent in 2008.
The food index, which rose 5.9 percent in 2008, fell 0.5 percent for the 12 months ending December 2009, the first December-to-December decline since 1961. The index for food away from home rose 1.9 percent while the food at home index fell 2.4 percent.
Bureau of Labor Statistics, U.S. Department of Labor, The Economics Daily, Consumer Prices in December 2009 at https://www.bls.gov/opub/ted/2010/ted_20100121.htm (visited September 29, 2023).