However, when comparing quarterly figures across 2022 and 2023, decreases in volume were greater in the second and third quarters of 2023, compared to the fourth quarter of 2023.
Fodd bynnag, wrth gymharu ffigyrau chwarterol ar draws 2022 a 2023, roedd mwy o ostyngiad mewn nifer yn ail chwarter a thrydydd chwarter 2023, o’i gymharu â phedwerydd chwarter 2023.