This was around for a while but wasn't updated for 5-8 years at one point. If I remember correctly originally the stats were pulled from the institution's website. Not sure how accurate they are.
I did notice a couple of things that are wrong on that table. For instance, those who take level 1 in 2017 should be the class of 2019 (the "year" spans from May of 2017 to April of 2018). The one school whose numbers I know for certain are not lined up correctly -- the "2017" average is correct if you are talking about the "May 2017-Apr 2018" average, but the NBOME average is not, it should be 95.95% or 96.0% if you are rounding (last years numbers were greatly inflated as I am sure many of you remember). The NBOME average given is for the year before. Interesting data though.
Currently 93.50% pass rate and 527.54 average. Usually over the course of the year those numbers creep down a bit as presumably the later test takers are more likely to be students who struggled and are not as strong. By the time all is said and done, this years stats will probably look much more typical than last year when the average score was ~40 points higher than normal.