Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Arena/Venue | Home Campus | Location | Province/Region | Maximum Seating Capacity | Year Opened |
| --- | --- | --- | --- | --- | --- |
| Blue Eagle Gym | Ateneo de Manila University | Quezon City | Metro Manila | 7,500 | 1949 |
| La Salle Coliseum | University of St. La Salle | Bacolod City | Negros Occidental | 8,000 | 1998 |
| Olivarez Sports Center | Olivarez College | Parañaque City | Metro Manila | unknown | unknown |
| Quadricentennial Pavilion | University of Sto. Tomas | Manila | Metro Manila | 5,792 | 2009 |
| San Agustin Gym | University of San Agustin | Iloilo City | Iloilo | unknown | unknown |
| University of Baguio Gym | University of Baguio | Baguio City | Benguet | 5,000 | unknown |
| West Negros University Gym | West Negros University | Bacolod City | Negros Occidental | unknown | unknown |
| Xavier University Gym | Xavier University - Ateneo de Cagayan | Cagayan de Oro City | Misamis Oriental | unknown | unknown |
| Holy Cross of Davao College Gym (HCDC) | Holy Cross of Davao College | Davao City | Davao del Sur | 7,000 | 2001 |
Question:
What year did the San Agustin gym open?
Answer:
unknown