Swaziland Exports of bitumen and asphalt (natural), bituminous or oil shale, tar sands to South Africa was US$15 during 2022, according to the United Nations COMTRADE database on international trade. Swaziland Exports of bitumen and asphalt (natural), bituminous or oil shale, tar sands to South Africa - data, historical chart and statistics - was last updated on April of 2026.