In USA, corporate taxation contributed about a dime on a dollar the U$.$S$.$ Treasury raised in recent $2$

decades. Two major corporate tax reform acts took place in $1986$ under President Reagan, and in Dec

$2017$ under President Trump. The $1986$ tax code resulted in multiple tax brackets for firms whose

taxable income is below $$18\mathrm{.}333333m,$ while the $2017$ tax code resulted in a flat $21\%$ corporate tax rate

regardless of taxable income level.

To do:

Go to reliable sources, such as The U$.$S$.$ Treasury, and fill out the following table.

Note: the four percent numbers in each column must sum to $100\%$