Hmm, I wonder...that's not something hospitals really tell you. They tell their c/s rate (which is a total lie; you could probably double whatever they say to get the correct answer!) but not their episiotomy rate, forceps, etc.
The Farm does have stats, but that of course is not a typical population sample. I also posted a poll a long time ago asking what interventions people had and another one asking where/how they gave birth, but again it's not a representative sample because according to the poll, which still occasionally gets a hit, over 50% had homebirths when the national rate is only between 1 and 5%.
You could also post at your local hospital that you are doing a survey and would like help.