Interesting data on income in the U.S. by sex

Over at the blog Political Calculations (see here) there is a very interesting post on "average real income in the U.S. by sex."  The graph below (click to enlarge) summarizes matters.

Here is an excerpt from the commentary:

"It's also interesting to note that since 1947, the annual average income earned by all individual women has nearly tripled, while the income for men has increased by a factor of 2.1. Meanwhile, the average income earned by all Americans has gone up by slightly less, doing just better than doubling in value during the time from 1947 to 2010."