Nine business schools have plunged by 20 or more places in the Financial Times Global MBA Ranking over the past five years. AGSM is at the top of the list, followed by South Korea's Sungkyunkwan University. AGSM fell 32 spots, while Sungkyunkwan dropped by 31. Only one U.S. school is on the list: Brigham Young University's Marriott School of Business.