Real GDP rose from $12.6 trillion in Q1 2001 to a peak of $15.0 trillion in Q4 2007, before ending at $14.6 trillion, a cumulative increase of $2 trillion or 16%.
Real GDP expanded from $12.6 trillion in Q1 2001 to a peak of $15.0 trillion in Q4 2007, followed by a decline to $14.6 trillion, showing an overall growth of $2 trillion or 16%.