Unsound Unsound:
Stats Canada says about 2% of Canadian identify as gay or bi. Among Olympic athletes I would expect the males to be slightly below the average number, and the females a little above. Based strictly on stereotypes, of course.
2% is far far too low. Remember, that's the number of people who CHOOSE to say their gay or bi on the long form census (which is now non-mandatory too).
I agree that 10% is too high. I would personally say that the number is likely 5-7% of the population (including closet cases who aren't open).