One of the largest influences on the level of interest rates is inflation. A number of sites report inflation over time. Go to the Federal Reserve Bank of St.Louis, FRED database Web site at https://research.stlouisfed.org/fred2/ and find the consumer price index for all urban consumers. Click on percent change from the previous year, which calculates the inflation rate. What has the average rate of inflation been since 1950, 1960, 1970, 1980, and 1990? Which year had the lowest level of inflation? Which year had the highest level of inflation?