By 2021/22 it had reached 25 months for both Year 6 and 9, and then by 2023/24 it was 23 months for both Year 6 and 9.
Erbyn 2021/22 roedd wedi cyrraedd 25 mis ar gyfer Blwyddyn 6 a 9, ac yna erbyn 2023/24 roedd yn 23 mis ar gyfer Blwyddyn 6 a 9.