From BLS:
The Consumer Price Index for All Urban Consumers (CPI-U) declined 0.1 percent in December on a seasonally adjusted basis, after increasing 0.1 percent in November, the U.S. Bureau of Labor Statistics reported today. Over the last 12 months, the all items index increased 6.5 percent before seasonal adjustment. The index for gasoline was by far the largest contributor to the monthly all items decrease, more than offsetting increases in shelter indexes. The food index increased 0.3 percent over the month with the food at home index rising 0.2 percent. The energy index decreased 4.5 percent over the month as the gasoline index declined; other major energy component indexes increased over the month. The index for all items less food and energy rose 0.3 percent in December, after rising 0.2 percent in November. Indexes which increased in December include the shelter, household furnishings and operations, motor vehicle insurance, recreation, and apparel indexes. The indexes for used cars and trucks, and airline fares were among those that decreased over the month.
www.bls.gov/news.release/pdf/cpi.pdf