Namibia Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Spain was US$3 during 2019, according to the United Nations COMTRADE database on international trade. Namibia Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Spain - data, historical chart and statistics - was last updated on May of 2024.