Comment by tzs

The thing that popped out to me playing around with that is that when you look at most of these things from the late '70s through now, many show some modest growth or flatness through the '90s, then grew a little more up through the 2010s or so, and have pulled back a little in the last few years to roughly 2008ish levels. This is for both math and reading and for both 9 year olds and 13 year olds.

Depending on what exactly you are looking at the places that it grew or was flat or declines change, but overall the big picture look gives me more "keep an eye on it" vibes than "we've got a crisis" vibes that some people seem to think are justified.