2210 was 98th percentile in 2013. But it was 99th in 2007.

If I remember correctly, I did SAT->percentile->average, rather than SAT->average->percentile; the first method should lead to a higher estimate if the tail is negative (which I think it is).

[edit]Over here is the work and source for that particular method- turns out I did SAT->average->percentile to get that result, with a slightly different table, and I guess I didn't report the average percentile that I calculated (which you had to rely on interpolation for anyway).

This one listed on gwern's website for example seems wrong.

It's only accurate up to 1994.