This site might or might not help (you've probably been through it): http://www.iswap.org/html/firsts.html
What if you were able to email the ISWAP? It is likely someone involved in the website knows where such statistics can be found, perhaps they may guide you in the right direction. Good luck, Blackbird.
Give her a break, she can ask whatever the heck she wants, there is no gun to your head to answer every question.
Having said that, this thread shows up in the top ten results on Yahoo while searching for the specific subject matter. Almost like there isn't enough info avail on the web (hint hint)
[Edited 2007-08-26 07:23:55]
The meaning of life is curiosity; we were put on this planet to explore opportunities.