Due to the cancellation of the normal examination period in both 2019 to 2020 and 2020 to 2021 as a result of the COVID-19 pandemic, data is not available for these years.
Oherwydd canslo'r cyfnod arholi arferol yn 2019 i 2020, 2020 i 2021, 2021 i 2022 o ganlyniad i'r pandemig COVID-19, nid oes data ar gael ar gyfer y blynyddoedd hyn.