Table 1 below shows Federal Tax Revenues, Federal Expenditures and the BudgetSurplus or Deficit from 1993 (the first year of the Clinton Presidency) to 2011.
One reason why this system cannot go on much longer is that Asia's crisis of 1997-98 put the budget deeply into deficitand, unaided, it may not return to surplus.
In early October the Treasury released a pre-election economic and fiscal update indicating that after 14 years in surplus the budget balance was set to slip into deficit.