That link didn't work - I'd be interested in any stats for countries other than Australia (I'm not as on top of the available statistics in other locations - I did give the OECD databases and Eurostat a gander, but neither went into enough detail to get to history - women dominated 'society and culture' or the closest thing to it in each, but as you say, that could include a bunch of other stuff). While the US may be different, I'd expect the UK and New Zealand to be at least somewhat similar. No idea about Europe, Asia or Africa though, and the Americas could likely be different.
Had a bit of a gander over at the ONS (Office of National Statistics, the UK's national statistical agency), and they're better than most (far, far better than going through the US statistical sites) - you can get numbers for 'Historical and philosophical studies' for 2008/09, with 43,600 males and 50,600 females (go to
http://www.ons.gov.uk/ons/datasets-...irection=none&newquery=field+of+qualification, download the excel spreadsheet for table 20 and look at table 20.9). The actual statistics keep pointing to the anecdotal feelings being expressed in this thread not being representative of the broader picture.