Belgium Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Portugal was US$19.12 Thousand during 2023, according to the United Nations COMTRADE database on international trade. Belgium Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Portugal - data, historical chart and statistics - was last updated on May of 2024.