The following table shows the composition of US federal tax revenues in 1993, 1997, 2001, and 2005.

a. Using the information provided in question 8, for the years 1993 to 1997 and 2001 to 2005, calculate the absolute change in federal tax revenues, the change in federal tax revenues in real (i.e., inflation-adjusted) terms, the change in real tax revenues per capita, and the change in tax revenues per GDP.

b. Which components of federal taxes had the largest relative increases from 1993 to 1997 and from 2001 to 2005? Which had the largest relative decreases?

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Federal Taxes ($ billions) 1993 1997 2001 2005 Individual income tax $ 509.7 $ 737.5 $ 994.3 $ 927.2 Coporate tax 117.5 182.3 151.1 278.3 Social insurance Excise tax Total 428.3 539.4 694.0 794.1 99.0 120.3 152.0 154.2 $1,154.5 $1,579.5 $1,991.4 $2,153.8