Within the Mineral Fuels category, ‘Petroleum, Petroleum Products and Related Materials’ was the highest value product with £3.7bn (20.3%) of Welsh exports.
O fewn y categori Tanwyddau Mwynol, 'Petroliwm, Cynhyrchion Petroliwm a Deunyddiau Cysylltiedig’ oedd y cynnyrch gyda’r gwerth uchaf - £3.7bn (20.3%) o allforion Cymru.