US CPI: Inflation Increased 7% In 2021; Highest In 4 Decades

5% over the last year, and 0. 5 percent during the same period, compared to the 1. 0 percent over the last year. 5 percent over the year. 6 percent over the year. 0 percent, the highest increase since January 1982. 1 percent in November and October. 2 percent in December, after increasing back-to-back over the last ten months. 3 percent, the same increase as in November. 1 percent, and the electricity index rose 6.