I am looking for information on the inflation rate and cost of living increase in the U.S. for the past 20 years.
There is a wealth of economy-related statistics at the Bureau of Labor Statistics web page This includes a comprehensive chart showing the average Consumer Price Index (CPI) for U.S. cities for every month, begining in 1913.
The CPI is an index of the changes in the cost of goods and services to a typical consumer, based on the costs of the same goods and services at a base period. It is sometimes called the cost-of-living index.
—The Fact Monster