Since stricter age requirements were adopted in the early 1980s, there have been several well-documented, and many more suspected, cases of juniors with falsified documents competing as seniors. The FIG has only taken disciplinary action in three cases: those of Kim Gwang-Suk of North Korea, who competed at the 1989 World Artistic Gymnastics Championships when she may have been as young as 11; Hong Su-jong of North Korea, who competed under three different birth dates in the 2000s; and China's Dong Fangxiao, who competed at the 2000 Olympics when she was 14.