The report from Sentier Research is here:
The March 2014 [real] median [annual household income of $53,043] was 5.7 percent lower than the median of $56,271 in December 2007, the beginning month of the recession that occurred over six years ago. And the March 2014 median was 6.9 percent lower than the median of $56,950 in January 2000, the beginning of this statistical series.