Question: What percent of the student population are graduate students at the Las Justas participating institution with the acronym UPR ?

text: Las Justas
Participants
As of 2012 , twenty-one universities participate in the event as follows : [ 23 ] [ 25 ]
The Justas de Atletismo y Festival Deportivo de Puerto Rico (English: Puerto Rico Athletic Games and Sports Festival) - better known as Las Justas Intercolegiales (English: The Intercollegiate Games) or simply as Las Justas (English: The Games) - is an intercollegiate sports competition held annually in Puerto Rico where Puerto Rican colleges and universities compete against each other in different sports. The event is sponsored by the Liga Atlética Interuniversitaria de Puerto Rico. The event usually include competitions in softball, basketball, beach volleyball, judo, table tennis, swimming, cheerleading, women's football, and athletics. The sporting event is supplemented by artistic presentations that take place after the events come to an end each night. The athletics portion of the events is attended by some 20,000 spectators, while the cultural events receive upwards of 150,000 guests. For many years the event was held in San Juan, but in 1993 it was moved to the city of Ponce, where - except for 2010 and 2016 - it has been held since. The week-long event takes place during the month of April. Due to the 2020 Puerto Rico earthquakes in the Ponce area, the 2020 edition of the Justas were moved from Ponce and are scheduled to take place in Mayagüez from 23 to 25 April at the Jose Antonio Figueroa Freyle Stadium.
Institution ( English ) Institution ( Spanish ) Acronym Location Year joined
University of Puerto Rico , Río Piedras Universidad de Puerto Rico , Recinto de Río Piedras UPR San Juan , Puerto Rico 1929
University of Puerto Rico at Mayagüez Recinto Universitario de Mayagüez RUM Mayagüez , Puerto Rico 1929
Interamerican University of Puerto Rico Universidad Interamericana de Puerto Rico UIPR San German , Puerto Rico 1929
Pontifical Catholic University of Puerto Rico Pontificia Universidad Católica de Puerto Rico PUC Ponce , Puerto Rico 1954
University of Puerto Rico at Cayey Universidad de Puerto Rico en Cayey UPRC Cayey , Puerto Rico 1971
University of Turabo Universidad del Turabo UT Gurabo , Puerto Rico 1975
University of Puerto Rico at Humacao Universidad de Puerto Rico en Humacao UPRH Humacao , Puerto Rico 1975
University of the Sacred Heart Universidad del Sagrado Corazón USC Santurce , Puerto Rico 1979
University of Puerto Rico at Bayamón Universidad de Puerto Rico en Bayamón UPRB Bayamón , Puerto Rico 1980
University of Puerto Rico at Arecibo Universidad de Puerto Rico en Arecibo UPRA Arecibo , Puerto Rico 1983
American University of Puerto Rico  AUPR Bayamón , Puerto Rico 1991
Bayamón Central University Universidad Central de Bayamón UCB Bayamón , Puerto Rico 1991
University of Puerto Rico at Ponce Universidad de Puerto Rico en Ponce UPRP Ponce , Puerto Rico 1992
University of Puerto Rico at Aguadilla Universidad de Puerto Rico en Aguadilla UPAG Aguadilla , Puerto Rico 1992
University of Puerto Rico at Carolina Universidad de Puerto Rico en Carolina UPCA Carolina , Puerto Rico 1994
University of Puerto Rico at Utuado Universidad de Puerto Rico en Utuado UPRU Utuado , Puerto Rico 1998
Polytechnic University of Puerto Rico Universidad Politécnica de Puerto Rico POLI San Juan , Puerto Rico 1999
Eastern University Universidad del Este UNE Carolina , Puerto Rico 2005
Metropolitan University Universidad Metropolitana UMET San Juan , Puerto Rico 2005
Caribbean University  CU Bayamón , Puerto Rico 2005