Real number …
From table 2 of link http://www.cobbk12.org/news/2016/PSAT2015.pdf
There are 1,724,416 11th grader taking PSAT. The national average TS is 1009 - about 2/3 max of 1520
There were 1.6+ mils 11th grader taking PSAT before 2015. The avg SI was 1500+ something - about 2/3 max of 2400
Look like statistics and history repeat themselfelf. Interpret the data anyway you want. It may be fun or not at all