Nobody has any compiled statistics on any of this. You might be able to get a rough idea from talking to the right people, though. Just don't expect any degree of accuracy in the numbers.
You can get an approximation of #2 by looking at which morphs are the most common. My guess is normals, amels, anerys, snows, hypos, ghosts, and motley versions thereof probably fill out most of the top 10.
-Kat