> Correlation doesn't equal causation.

I know, but I wasn't asked for causation or proof. I was asked for data, or evidence. Presumably, I was being asked for evidence consistent with my hypothesis and unlikely to have occurred by random chance. That's what I gave.

Besides which: I never claimed that this was the only factor. I claimed it was a factor. Elsewhere, I acknowledged that there are other factors. I'm sure the the Oregon policies you list are among them.