2020-2021 match cycle was quite difficult due to limited MS4 rotations in the island, so don't be surprise if the match rate of all 4 schools went down. The only school that made their stats public was SJB school of medicine which was 88% initially and 90% after SOAP, but take into consideration that their class is small in size ( 38 seniors made match). In comparison UCC, Ponce and RCM have more people participating in the match so it would not be surprising that their match rate was below 90%. Also, all four PR schools have a good representation in a wide variety of specialties and US territory.
Ponce match is quite a mystery but usually they have a good representation in the US territory. The following are 2021 match results made public by schools or social media:
SJB match in places like University of Nevada, GW, Miami, New Mexico, etc...
UCC match in places like Harvard, Yale, NIH, UCLA, Mayo Clinic, GW, Columbia, etc...
RCM match in places like Baylor, Stanford, Emory, Duke and as usual dominated RCM residency programs.
Hope this info can help.