I find it's relatively difficult for me to make confident assumptions on type distribution for a couple of reasons:
1) Certain types stand out more than others increasing the likely hood of you noticing them i.e. extroverts and ethical types
2) Certain types are under-represented in almost any kind of social setting - i.e. Introverts
For these reasons the best I can do is try to remember high school. High school I think would be a solid place to look for type distributions because it's mandatory (at least in Ontario) so all types should be there in whatever distribution they are in society as a whole. However, even then, distribution would not be equal in all classes. In woodshop from what I remember there were mostly sensory types, perhaps sensory introverts being most represented.
I think sensory types as a whole outnumbered intuitive types. My high school was pretty small (900 students maybe, with five grades) and so in my grade there would be about 130ish people. I don't have my yearbook near me at the moment or else I could try to VI and remember lol.
I'll have to think about it, in the meantime though if any of you have a good memory what was the type distribution (by your own estimation) of your high school graduating class?