Serbia Exports of coke, semi-coke of coal, of lignite, of peat; retort carbon to Montenegro was US$4.6 Thousand during 2020, according to the United Nations COMTRADE database on international trade. Serbia Exports of coke, semi-coke of coal, of lignite, of peat; retort carbon to Montenegro - data, historical chart and statistics - was last updated on May of 2024.