Government receipts as percent of GDP 1948-2007 From http://www.whitehouse.gov/omb/budget/fy2009/hist.html
Government expenditures as percent of GDP 1948-2007 From http://www.whitehouse.gov/omb/budget/fy2009/hist.html
U.S. Government employment per thousand 1962-2007 From http://www.whitehouse.gov/omb/budget/fy2009/hist.html
Federal Receipts by source as percent of GDP 1934-2007 From http://www.whitehouse.gov/omb/budget/fy2009/hist.html