That is the UK Statistics Authority has designated these statistics as National Statistics, signifying compliance with the Code of Practice for Statistics.
Hynny yw, mae Awdurdod Ystadegau’r DU wedi dynodi’r ystadegau hyn fel Ystadegau Gwladol, sy’n dangos ei fod yn cydymffurfio â’r Cod Ymarfer ar gyfer Ystadegau.