The UK-level data, together with a full description of the sources and methods used to compile these data can be found on the GOV.UK website (Maritime and shipping statistics (DfT)).
Gellir gweld y data ar lefel y DU, ynghyd â disgrifiad llawn o ffynonellau'r data a sut ydym yn crynhoi'r data ar wefan GOV.UK (Maritime and shipping statistics (Department for Transport)).