Switzerland Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Gambia was US$2.25 Thousand during 2021, according to the United Nations COMTRADE database on international trade. Switzerland Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Gambia - data, historical chart and statistics - was last updated on June of 2024.