For this release, we have used 2022/23 as a consistent year of reference across all subjects, both for calculation of an average month’s progress and as a benchmark of the difference between years.
Ar gyfer y datganiad hwn, rydym wedi defnyddio 2022/23 fel blwyddyn gyfeirio gyson ar draws pob pwnc, i gyfrifo cynnydd cyfartalog mis ac fel meincnod o'r gwahaniaeth rhwng blynyddoedd.