After-tax income change since 1979

I realize that distribution of wealth (and "redistribution of wealth") are hot-button topics that can trigger rather vigorous debate. So for the moment I'll just offer the raw data in graphic form.

This graph is from the Congressional Budget Office. It's entitled "Real After-Tax Average Income as a Percent of 1979 Income. By income group. The pale blue line shows the change for the top 1%. The x-axis goes up to 2006 data. (Via Yglesias)