JAKARTA: The Indonesia Stock Exchange (IDX) closed 2017 with a big bang. On Dec. 29, the last day of trading, the Jakarta Composite Index (JCI) reached a record high of 6355.65. It was higher than in China (6.6 percent), Singapore (18.1 percent), Malaysia (9.5 percent) and Thailand (13.7 percent). Out of that gain, a 6.8 percentage point increase was recorded in December alone. This was unprecedented.