Madagascar Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Hong Kong was US$5.3 Thousand during 2007, according to the United Nations COMTRADE database on international trade. Madagascar Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Hong Kong - data, historical chart and statistics - was last updated on May of 2024.