Singapore Exports of unsaturated acyclic or cyclic monocarboxylic acids, their anhydrides to Bhutan was US$184 during 2022, according to the United Nations COMTRADE database on international trade. Singapore Exports of unsaturated acyclic or cyclic monocarboxylic acids, their anhydrides to Bhutan - data, historical chart and statistics - was last updated on May of 2024.