@ican711nm,
ican, It only proves you have no idea why revenue trends changed during those periods. It's called myopia and ignorance.
CLUE: When the economy grows on false wealth as they did during the eight year period that ended in 2008, through Greenspan's easy money, mortgage derivatives, and consumer spending from debt, that did grow the government revenues. But that was a trend that could not be sustained; something you'll never understand.
We now call that the Great Recession, because it's the worst economic disaster since the Great Depression. You can thank GW Bush and Greenspan for not knowing how to handle tax rates, the increasing national debt, money policy, the loss of jobs, and wall street gambling from their de-regulation.