sorry ID - thought i'd responded to this.
data on pedophiles is difficult to find, mostly because it's such a stigmatized condition
the best available data, based primarily on conviction rates and educated guesses suggest that some 10-20% of the general population have an attraction to some particular age of child
the true pedophile, who is solely or primarily attracted to children is even harder to get data on
I looked into this extensively when I was in an abnormal psych class and a sociology class a couple of years ago - turns out the soc teacher was more help than the psych teacher - the psych teacher was a clinical psychologist who refused to see pedophiles as clients. She had a valuable perspective and understanding of them, but I had to be sensitive to her reluctance to go into it in too much depth. The soc teacher, on the other hand was a retired army MP who had encountered a lot of child abuse and child abusers in his previous career. Heckuva a great guy, i stayed in touch with him after that semester ended and count him as a friend.
short answer to your questions?
nobody really knows