The US Inflation Calculator economic site now has a newly updated Inflation Rates information section that includes a chart, graph and table of monthly and annual inflation rates for the last decade.
The rates of inflation come directly from the latest Consumer Price Index (CPI) data published by the Bureau of Labor Statistics (BLS). The chart and graph offers an excellent visual tool for seeing how rates have changes throughout the years.
In economics, the inflation rate is a measure of inflation. In this case, the rate of increase of the Consumer Price Index. The rate of increase/decrease in the purchasing power of dollar is about equal.