I guess the Chinese are particularly superstitious about these numbers things. Maybe they should be. According to the Taipei Times, the divorce rate in Taiwan doubled between 1996 and 2007. Story on the wedding here.
Newly married couples gather during a mass wedding on the auspicious day of Thursday, Sept. 9, 2010, in Taipei, Taiwan. One hundred sixty-three couples in Taiwan were married in the mass ceremony at 9:09 a.m. Thursday, the ninth day of the ninth month of the 99th year since the founding of their republic. The word for nine in Chinese sounds exactly like the word for longevity, so there was method in the decision by Taipei city authorities to organize the nine-nine-nine-nine-nine-nine nuptials when they did.