Tonga Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Japan was US$0 during 2018, according to the United Nations COMTRADE database on international trade. Tonga Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Japan - data, historical chart and statistics - was last updated on July of 2026.