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Hmm.... This is hardly physics, so I should suppose that I should let this go, but a search from the CDC has this data for 2011.
From http://www.cdc.gov/hiv/statistics/basics/index.html
In 2011, there were about 49,000 new diagnoses of HIV. Of those, about two-thirds were from male-to-male sexual contact. About a quarter, though, were from heterosexual contact.
Zeke