What percentage of population can do touch typing?

So having grown up with computers, being able to type without looking at the keyboard is just something that is natural to me.

But considering that there is whole threads and all about people learning it, I guess a lot of people can't do it?

But also with how common texting on phone is, most people should already have a pretty good mental map of QWERTY keyboards, right?

But then again, how common is actual lengthy chatting (not just a message or telling each other some status or to meet up) for people?

But then also, writing e-mails is at least common? And if you do any sort of research project, typing that up would also be common?