[Note 3] The difference between the number of staff joining and leaving equals the change in the number of staff working between 30 September 2021 and 30 September 2022.
[Nodyn 3] Mae’r gwahaniaeth rhwng nifer y staff a ymunodd ac a adawodd yn hafal i’r newid yn nifer y staff a oedd yn gweithio rhwng 30 Medi 2021 a 30 Medi 2022.