The continued designation of these statistics as National Statistics was confirmed in June 2020 following a compliance check by the Office for Statistics Regulation (letter of confirmation).
Cadarnhawyd dynodiad parhaus yr ystadegau hyn fel Ystadegau Gwladol ym mis Mehefin 2020 yn dilyn gwiriad cydymffurfio gan y Swyddfa Rheoleiddio Ystadegau (llythyr cadarnhad).