 Complete the following phrase:  Ninoy Aquino Stadium was originally built in the 1950s as an open-air stadium, in time for the 1954 Asian Games. By the 1980s, it had been converted into an indoor arena named the Rizal Multi-Purpose Arena, in time for the 1989 ABC Under-18 Championships, which opened on January 24, 1989. At the opening of the tournament, it was renamed the Ninoy Aquino Stadium and a marker dedicating the arena was unveiled. The renovation included new chairs and a new scoring system from South Korea installed by Korean technicians. It also hosted the volleyball tournament of the 