You cannot use the SAT as a metric to compare different cohorts. SAT scoring has been revised many times over the years. When I took it the highest possible score was 1600. From 2004 through 2016 the highest score was 2400. Now it is back to 1600 again. Plus, both the content and the format of the exam has changed many times over the years. At times, there was no essay requirement, at times the essay was required, and at times it was optional. Hence, each year the examination produces a different distribution/histogram of scores even if you normalize the 1600 vs 2400 difference.