[citation needed]
EDIT:
Reason I ask is that, when fighting for the cause of minority groups, it doesn't help to make claims that are easily shown to be false--it hurts your credibility, and by association, theirs.
The "x are everywhere" is what, for example, brought us the Iraq War and the TSA and all the rest...just good marketing whipping people up into a frenzy.
EDIT2:
Fine, for the downvoters, here's some citations (because apparently that's too much to ask):
Various studies show a rate of between 0.1-0.5% of people identifying as trans ( http://fivethirtyeight.com/features/why-we-dont-know-the-siz... ).
A 2011 study by the UCLA Williams Institute found there to be around 700,000 trans people ( http://williamsinstitute.law.ucla.edu/research/census-lgbt-d... ).