The headline consumer price index (CPI) increased 1.5 percent over the last 12 months, an acceleration from a 1.2 percent pace in November. On a year-over-year basis in December, core CPI (excluding food and energy) remained at 1.7 percent for the fourth month in a row. Headline CPI jumped 3.6 percent and core CPI rose 1.3 percent on a monthly annualized basis in December.