Some of your questions might be answered if you look at these statistics:
http://www.uky.edu/StudentAffairs/Greek/stats.htm
http://www.uky.edu/StudentAffairs/Greek/general.htm
If you poke around a bit, you'll find all kinds of historical information on the UK site.
Good luck! I'm rooting for you to find your home!
Edited to add another page of statistics