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I looked through that list, and once you filter out the non-school deaths, it seem to line up with the article.

For example, Rancho Tehama Reserve, California is listed as six deaths, but that was a shooter who killed five adults at other locations, then fired at a locked down school, injuring one student, before killing himself. So zero students killed. There are quite a few like that in the list.

First I'm not sure that is a good source. We have no idea if this list is vetted. Second, just because there is an increase in volume doesn't necessarily mean an increase in rate.

I'd it a trend though? Or is it just reporting accuracy? Perhaps just scaled to population it is constant?

A Wikipedia list does not answer any of those questions.