I mean, I no longer attend an MMA gym so I can't speak on the current number but when I did there seemed to be plenty of ladies there.
I just don't want to assume. The MT class I attend is after an MMA class and a few of my lady friends there also take that class, but I obviously am in no position to speak on their attendance.
I find it funny that you would jump on those arts as not being MMA, as they are crucial aspects of the sport. When I did go to an MMA gym, I would argue that the amount of people there training solely MMA was incredibly low. Most everyone stayed for the BJJ/Judo/Boxing classes that also took place there.
Anyway, since we're both arguing through personal experience it's pretty silly to continue. You could train at a gym with no girls and I could train at a gym with 99% of the students being female, and we wouldn't know the national, or international, percentage of women in the average MMA gym.
http://mainemartialarts.com/martial-arts/martial-arts-statistics-demographics-people-practice/
^ that is an article talking about Martial arts participation in Maine, and is the best thing I could find numbers wise. Again, we will never be able to reach an actual number by just guessing. There are too many circumstances to consider. Personal experience is only worth so much.