Also, many of Bush's tax cuts began in 2001, making the first chart misleading.
[link|http://www.cbpp.org/10-21-03tax.htm|Center on Budget and Policy Priorities] (from 2003):
The final budget figures for fiscal year 2003 were released on October 20 by the Treasury Department. They indicate that income tax receipts (including receipts from both the individual and corporate income tax) equaled just 8.6 percent of the Gross Domestic Product. This is the lowest level of income tax collections, as a share of the economy, since 1942. The decline in income taxes as a share of the economy to a level last seen six decades ago helps explain several other key findings about the final budget tally.
[...]
(I haven't been able to find similar data for a later period.)
[link|http://www.cbpp.org/1-31-07tax.htm|CBPP]:
The President and members of the Administration routinely argue that the tax cuts have produced a robust economic expansion and should therefore be made permanent for the sake of the economy. This argument does not withstand scrutiny.
Every recession in modern U.S. history has been followed by an economic expansion, regardless of whether taxes were cut, increased (as in the early 1990s), or left unchanged. The recent tax cuts were not responsible for the current recovery, just as the tax increases of 1990 and 1993 were not the reason the economy recovered from the downturn of the early 1990s, instead of remaining permanently stagnant.
Moreover, compared with other post-World War II recoveries, the current recovery is not an exceptional one, and by some measures is well below average. If tax cuts are crucial to economic growth, then the current recovery should stand out brightly in comparison to previous recoveries. It should certainly outshine the comparable years of the 1990s recovery, which followed two significant tax increases. Instead, economic growth has been weaker during the current recovery than during the average post-World War II recovery and about the same as during the comparable years of the 1990s recovery. Investment growth has been notably weaker in the current recovery than during the average previous recovery and the recovery of the 1990s, and employment and wage and salary growth have been especially weak. Employment growth during the current recovery has been slower than during any prior post-World War II recovery.[3]
Emphasis added.
FWIW.
Cheers,
Scott.