According to the official report,

Getting an LSAT score of 180 or a “perfect score” is extremely rare. According to data published by the Law School Admissions Council (LSAC), from 2006-2009 of all LSATs administered, approximately 144,000 per year, only 0.1% received a 180. The advantage for the student who earns a 180 LSAT score is that he or she is more likely to be accepted into a top-tier law school. Yale Law School reports that for its class of 2014, the LSAT score range was 154-180, with over 75% of enrolled students receiving an LSAT score of 177 or above.