New Zealand Exports of unsaturated acyclic or cyclic monocarboxylic acids, their anhydrides to Tonga was US$475 during 2021, according to the United Nations COMTRADE database on international trade. New Zealand Exports of unsaturated acyclic or cyclic monocarboxylic acids, their anhydrides to Tonga - data, historical chart and statistics - was last updated on May of 2024.