Oman Exports of coke, semi-coke of coal, of lignite, of peat; retort carbon to Yemen was US$195 during 2019, according to the United Nations COMTRADE database on international trade. Oman Exports of coke, semi-coke of coal, of lignite, of peat; retort carbon to Yemen - data, historical chart and statistics - was last updated on May of 2024.