Link?
edit: I found this link from 1992 to 2005...I certainly dont see taxes collected "plummeting" from the rich
Who said plummeting? The only reference I saw to plummeting was made by you. Tax receipts from the rich have decreased in relation to their share of AGI. This is fact. Decreased is not plummeting. I suppose its easier to challenge the claim that the receipts are plummeting, but I certainly never made the claim, but, hey, you have your fun.
Here is your link, data also available from the IRS, but you should like this one.
http://www.taxfoundation.org/news/show/250.html
Your graph supports my statement. Quite clearly, the rich's income is increasing at a greater rate than their taxes paid. Without looking at incomes, stating that the rich are paying more in taxes is meaningless. Yes, the rich are paying more in taxes in dollars. However, that is solely due to the astronomical increase in incomes which are increasing at a greater rate than their taxes. For the bottom 50% their taxes paid have decreased. Unfortunately, so has their incomes.