When considering tonnage, most sea imports into Welsh ports come from non-EU countries – unsurprising given the dominance of oil products and liquefied gas (Figure 5).
O ran eu pwysau, daw'r rhan fwyaf o'r mewnforion môr i borthladdoedd Cymru o wledydd y tu allan i'r UE - nid yw'n syndod o ystyried goruchafiaeth cynhyrchion olew a nwy hylifedig (Ffigur 4).