Cummulative income gains 1947 to 1979
Cummulative income gains 1980 to 2009
Bottom fifth
$26,934 or less
122%
−4%
Second fifth
$26.935 to $47,914
101%
7%
Third fifth
$47,915 to $73,338
113%
15%
Fourth fifth
$73,339 to $112,541
115%
25%
Top fifth
$112,541 or more
99%
55%
Data for the US.