On August 2012, the number of Puerto Ricans on the U.S. mainland reached a record - 4.9 million. Had these people remained in Puerto Rico, the island would be so densely populated that there would be virtually no room for people to live.oday, education is a matter of high priority for Puerto Rico, it is evident in the island's overall literacy rate of 94 percent and its budget for education, approximately 40 percent.