Unforunateseriesofevents
It's actually far harder to find links now. About anything to do with trans.
When I first googled the stuff a few years ago, the information was readily available. Not so much anymore.
This is a link, the date of which I can't find (although I have a feeling it's 2009 as I believe I've read it before). It says since the year 2000, 853 genital surgeries on men have been carried out.
I think the estimate for how many people are trans is about 700,000?
Although, I have seen it much higher than that, too.
You need to google transwomen genital surgery statistics, or words similar.
It's worth noting that the words gender reassignment surgery do not necessarily mean genital. It can facial feminisation, for instance. (Adams apple shaving and jaw minimising.)
www.bournemouth.gov.uk/councildemocratic/Statistics/Documents/JSNA/GenderReassignment.pdf
Transactivists have definitely got at certain information online.
When I first googled autogynephilia, The top five sites were about men talking about it. I actually copied and pasted some of the stuff they said and sent it to my MP. As it was fairly self-explanatory in its shock value.
If you google now, you get sites saying it's a made up illness, and anyway natal women have it (!).
I'll keep looking to see if I can get any more statistics, although I think it's fairly understood it's about 80 percent. That doesn't tend to get disputed.