Okay. Well the good thing about science is there's lots of correlation figures you can go check out at any time instead.

But there are some more simple ways to see it like how obviously no one was known to have ADHD before it was identified. And how more people have it as it's definition continues evolving to be more detailed and broad. That's normal behaviour for conditions in medical science. We must know of its existence before anyone can have it; more people tend to have it as our understanding of the thing improves by leaps and bounds.