I'm not trying to dodge the question, but depending on how many years back you want to go, assembling the information could be quite an undertaking, not to mention potential accuracy issues if you're forced to rely on mine or anyone else's memory.
As a starting point, how about a short questionnaire that players would fill out when, assuming you're planning on continuing the practice, you offer them free sheets for NHC XI?
I talked to Jeff Lowich, and while all of the details are not final, Mth's Super Qualifier in all likelihood will be a minimum of ten $20 WPS plays on the Mth and Sar cards, although five of the 10 races have to be Mth races. The maximum number of entries per player is two, and sign-ups will not start until mid-July.