Botswana Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Namibia was US$411 during 2018, according to the United Nations COMTRADE database on international trade. Botswana Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to Namibia - data, historical chart and statistics - was last updated on May of 2024.