Public examinations were disrupted in 2020 and 2021 due to the COVID-19 pandemic, whilst 2021/22 was a transitionary year in which pupils sat written exams with some adjustments.
Oherwydd canslo'r cyfnod arholi arferol yn 2019 i 2020 a 2020 i 2021 o ganlyniad i'r pandemig COVID-19, nid oes data ar gael ar gyfer y blynyddoedd hyn.