I put up graphs last summer on female LF participation at the link below; I just updated the graphs with data through CY2013 but did not change the prose.

http://newjapanforum.wordpress.com/2013/08/25/114/

Let me add that as Earl noted, "part-time" is a legal not a functional definition. That can be true elsewhere, too: my son was a part-time contract worker at a local (rural Virginia) factory who in fact worked 10-hour days, and sometimes 6-day weeks. He did get extra pay for the extra hours.

mike smitka, economics
washington and lee university=