The figures are produced as Experimental Statistics (Guide to Experimental Statistics (Office for National Statistics)), that is, they are in the testing phase and not yet fully developed.
Cynhyrchir y ffigurau fel Ystadegau Arbrofol (Canllaw i Ystadegau Arbrofol (SYG)) hynny yw, maent yn y cyfnod profi ac nid ydynt wedi eu datblygu’n llawn eto.