Well, dissonance, the problem with all such figures, even for the MBTI, is that it is skewed to those who would be interested in test taking and typology, as well as the fact that it is often skewed toward people who use the internet.
Much of the figures we see out there are conjecture.
This place
Enneagram Test Stats, for instance, collected the avarages of the test takers. You can see by the results though, that this really appears to be more of an assessment of which types use the internet the most.
I can't think of a place that does the general population, off the top of my head.
Now, if you want, I can try to do online scounging for you, and save you the trouble.
EDIT:
I take back my previous edit. They didn't even out the genders.
