I recognize that this is kinda subjective, but I'm a bit baffled that someone wouldn't find 1-in-20 to be "common".
Though it's not homogenous, that's very conservatively the equivalent of one child in every classroom. It's millions of people, even in a small country.
Though it's not homogenous, that's very conservatively the equivalent of one child in every classroom. It's millions of people, even in a small country.