The TAIEX moved marginally down on its last trading day of the year, after rising 23.7 percent over the past 12 months, the third-largest increase for a single year, Taiwan Stock Exchange (TWSE) data showed. The index initially hit an intra-session high at 18,291.25 points yesterday, but gradually fell before closing down 0.16 percent at 18,218.84, with turnover of NT$263.167 billion (US$9.5 billion), the data showed. Starting at 14,720.25 points on Jan. 4, the TAIEX advanced 3,486.31 points this year, compared with an increase of 2,735.39 points last year. The index registered its highest annual increase of 4,505 points in 1989 and