Clay’s Surveys | TangoClay
has an interesting result:
Extraversion 36%
Introversion 64%
That's flipped from the general population in the U.S. I might have thought he made a mistake, but from personal experience I can believe the numbers are right. (Caveats for self selected, not a scientific survey, etc.)
I don’t know what the ratio in general population is. Personally I have always felt that there are disproportionately far more introverted in social partner dancing that in general life. Is above survey self-reported.