This statistic shows the annual inflation rate in the U.S. from 2010 to 2019 with additional projections up to 2021. The data represents U.S. city averages. The base period was 1982-84. In economics, the inflation rate is a measurement of inflation, the rate of increase of a price index (in this case: consumer price index). It is the percentage rate of change in prices level over time. The rate of decrease in the purchasing power of money is approximately equal. According to the forecast, prices will increase by 0.62 percent in 2020.