[formerly_proven]

As per Wikipedia there is really bad/no data on this because almost all research relies on convicted pedophiles and going around making “are you a pedo, perchance?” surveys in the general population simply does not work.

[ainch]

Germany has an anonymous support programme for people who feel paedophilic urges but don't wish to offend. I believe they've used that network for research, but I think it's probably quite a limited, and potentially biased, sample.