Vicky, I think you're missing part of Jill's point. I, obviously, have been trans all my life, and yet, I had absolutely no clue until last December. Fifty four and one half years. Any one of you, knowing me, could have seen it clearly. I didn't. How can the government accurately count a population that doesn't know it exists?
Suzi's right. Even knowing how many people are trans and aware would be a huge step forward, but it wouldn't tell the whole story.
A friend of mine didn't realize she was trans until I came out to her.