I think that there were around 80 to 100 pretty regular witnesses who left eventually from Oklahoma City in the 1979 ti 1985 blowup. I could not say exactly how many I personally had a hand in, but I believe it would be safe to say from five to ten.
There were at least four witness families involved, and a majority of them left then and have been gone for about 30 years now.
Many others have left the JWs from OKC, of course, but I am talking about those who were close to the Ray Franz/Dunlap issues.