Using the historical tables available at the budget tab of the website of the U.S. Office of Management and budget, prepare an analysis of the trends in the following data, total federal outlays, total defense spending, and total mandatory spending. Do the analysis in both current and constant dollars. Provide your interpretation of what forces are driving the patterns that you observe. (for the past 20 years).

I would like to really know the equation on how to correctly collect the data for the current and constant dollars with the data of the last 20 years.