This graph is from a new study from the Congressional Budget Office:
Here is Neil Irwin at the Ezra Klein blog:
This economic recovery has been a big disappointment relative to what the United States has usually experienced after a recession. Growth has been 9 percent below what was seen in past recoveries on average in its first three years…The new CBO report claims that two-thirds of the underperformance of the economy over the past three years compared to a typical recovery is due to a slower rate of growth in potential GDP. Only one-third, in this analysis, is due to factors related to this recession.