Effective Tax Paid By Wealthiest Americans 1948-2005
Source: Congressional Budget Office, Department of Treasury reports
http://www.cbo.gov/showdoc.cfm?index=5746&sequence=1
http://www.cbo.gov/showdoc.cfm?index=5324&sequence=0#table1A
http://www.huppi.com/kangaroo/3Taxes.htm