 The Puerto Rican population was at its height around 1980 when they represented about 30% of the Bronx, it declined in the 1990s and early 2000s, and it is relatively stagnant now.The Dominican population has been growing heavily since the 1990s.As of 2017, Dominicans made up 22.4% of the Bronx population, while Puerto Ricans made up 19.6%, giving the Bronx some of the highest concentrations of both in the country.