Well let me think here...
I know in the past ten years two sororities have recolonized (Alpha Phi and Phi Mu) and no other chapters have been closed, so we now have a total of 14 NPC sororities. That is my knowledge anyway, but I could be wrong.
As for fraternities...well, Sigma Chi got their charter pulled last year due to extremely bad hazing, it was so sad b/c that was a chapter that had been on this campus for decades.
(It was also the same chapter that Brad Pitt was a member of
)
ANYWAY, this year we gained Acacia, Lambda Chi (who is living in Sig Chi's house for the next four years), and Sigma Tau Gamma. Lambda Chi was here in the early 90's but after an alcohol violation their charter was pulled and now we (Phi Mu) live in their old house which was originally ours anyway. Confusing stuff.
Delta Sigma Phi also lost their charter but they got it back in the fall of 2001 and they're now a pretty good chapter, kind of small, but they are awesome at philanthropies they always seem to win everyones!
I know that we used to have a TKE chapter, a Pi Kapp chapter, and maybe something else b/c their banners all still hang in the rec center, but they've been gone for as long as I've been here.