[tieTYT]

Just commenting to add more graphs:

http://www.npr.org/blogs/money/2014/10/28/359419934/who-stud...

http://www.randalolson.com/2014/06/15/the-double-edged-sword...

[protomyth]

which leads to http://www.bls.gov/cps/cpsaat11.htm