Everything has been pretty stable for quite some time, but IIRC, the station with the most format changes is 104.1, which was:
Oldies
CHR
Rock/CHR
Disco
Country
Rock
Alternative Rock
Country
Classic Country
Smooth Jazz
Modern AC
All-80s
Variety Hits
By comparison, I think the 105's have had 10 formats, 96.3 had 5 formats (as a TC Signal), 95.3 has been VERY stable being religious for most of it's life. Next would probably be 100.3 which was Bible for years, then Country, then Rock, then Classic Hits, then Smooth Jazz, then Conservative Talk, then Sports.
The rest of the sticks either have had very few formats, or have had formats that have evolved over time (like KQ, Kool 108, KDWB) but have been basically the same.