Statistically, approx 80 million people stutter. We did research in 2017 and figured out that about 75K are involved in the world stuttering support community (in-person and online). That's a generous number, btw. That means about 1 in 1066 of us talk about stuttering. I think most of the other ones are "quiet" or "shy". I know that I kept my mouth shut for a long time...