For those interested to know this especially if they have a son or daughter planning of going to medical school this year, you may want to look at this pictures. I think this was discussed during a APMC-initiated forum among medical schools. The pictures do not show all the medical schools, just some with a higher than 50% average. Of course deciding as to what is the best medical school does not lie on Board Exam percentage alone.
These stats are from 2001-2010.