Switzerland Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Liberia was US$5.37 Thousand during 2018, according to the United Nations COMTRADE database on international trade. Switzerland Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Liberia - data, historical chart and statistics - was last updated on June of 2024.