Singapore Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to St Kitts and Nevis was US$108 during 2016, according to the United Nations COMTRADE database on international trade. Singapore Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to St Kitts and Nevis - data, historical chart and statistics - was last updated on May of 2024.