Answer

An inflation rate is the rate at which the general level of prices for goods and services and consequently, the purchasing power of currency is falling. 

Go to the Business Library's Economic and Statistical Information section for links to useful resources including the following suggested resources.  

Data-Planet Statistical Datasets: Go to the Browse by Subject section and choose, Price and Cost of Living, Inflation Rate. Data is available for 20 years. 

Statista: Search “inflation rate” and refine your search by Location Focus, United States.  Data is available back to 1990 for the United States. 

You may also want to consult the following resources:

Federal Reserve’s FRED Economic Data website, 10 Year Inflation Rate.