To Rader, no one knows the true percentage, since so many crossdressers are in the closet. And among the TSs, the only real numbers we have are people who seek medical attention for the gender dysphoria.
Estimates of the TG community at large range anywhere from one tenth of one percent, to one percent, to five percent, to ten percent, although this last number seems high to me, when I compare the number of TGs that I've come across in my life. The number of crossdressers is far greater than the number of transsexuals, but again, there are no real numbers.
The statistics for our forum membership are located at the bottom of our Index page. We have over 27,000 members and about 7,000 have posted in the last three months. If you wish to know what parts of the forum are most active (CD vs. TS), just look at the number of threads & posts: about 70,000 threads in the CD section vs. 5,000 threads in the TS section.