In 1992 it was $6.3 trillion, a double.
In 2005 it was $12.4 trillion dollars, another double.
Doubling in roughly 12-13 years. Not bad, right?
Let's look at it a different way, this time in "current" (not inflation-adjusted, since GDP isn't) dollars.
In 1981 the per-capita income in the US was $8,476.
In 1992 it was $14,847, a 75% gain.
In 2005 it was $25,036, a 69% gain.
Notice anything?
Its not really that subtle, is it?
GDP slightly more than doubled in each of those above periods, but per-capita income lagged, and the lag rate is increasing