The sports teams had outdated stadiums, and they had threatened to leave Houston. The Houston Oilers did so after several threats, so the city built Enron Field, now Minute Maid Park for the baseball team. Reliant Stadium was erected for the Houston Texans. Tropical Storm Allison devastated many neighborhoods with flooding in June 2001. At least 17 people were killed around the Houston area when the rainfall from Allison that fell on June 8th and 9th caused the city's bayous to rise over their banks. In October 2001 Enron, a Houston-based energy company, got caught in accounting scandals, ultimately leading to collapse of the company and its accounting firm Arthur Andersen, and the arrest and imprisonment of several executives. In 2002, the University of Houston celebrated its 75th anniversary with an enrollment of 34,443 that fall semester. At the same time, the University of Houston System celebrated its 25th anniversary with a total enrollment of over 54,000. The new international Terminal E at George Bush Intercontinental Airport opened with 30 gates in 2003. The Toyota Center, the stadium for the basketball and hockey teams, opened in fall 2003. METRO put in light rail service on January 1, 2004. Voters have decided by a close margin (52% Yes to 48% No) that METRO's light rail shall be expanded. In the aftermath of the Hurricane Katrina disaster, about 35,000 New Orleans residents resettled in Houston. Six Flags Astroworld, Houston's only large theme-park, closed in 2005.