This was inspired by Mickey Kaus's Kausfiles recent post The Most Important Chart, which included a graph showing relative changes to "real hourly wages" since 1973, based on education level. The data was credited to the Economic Policy Institute (EPI).
I griped (somewhat) in a comment at Kausfiles because the chart's newest data was from 2005, over a decade old.
I googled around a bit, and discovered that EPI had more recent data online here. After some moaning and groaning with Google Docs spreadsheets …
Here is EPI's raw data, "average hourly wages of workers disaggregated by the highest level of education attained" (2016 dollars).
As noted above, Mickey's chart is "normalized" to track changes relative to 1973 wage levels. Here's that chart (1973 = $100):