[Mike V. Florida]

There is no way to get the true number.

There are a whole group of problems;

1) The very first problem I see it what constitutes an A?
2) You can buy the DMV lists from third party narrowed down by location, model, etc. but see number 1
3) even if you could get info from insurance companies, see number 1

Anyway you get the idea. I believe there are at least as many (if not more) are not on any DMV or Insurance rolls as there are recorded. And see number 1.