National Statistics Status The data collection, validation and publication was in line with the Code of Practice for Statistics and it was designated as National Statistics.
Statws Ystadegau Gwladol Roedd casglu, dilysu a chyhoeddi data yn unol â'r Cod Ymarfer ar gyfer Ystadegau ac fe'i dynodwyd yn Ystadegau Gwladol.