Most of the staff groups at 30 June 2021 included staff on short-term or fixed contracts brought in to help during the coronavirus (COVID-19) pandemic.
Roedd y rhan fwyaf o'r grwpiau staff ar 30 Mehefin 2021 yn cynnwys staff ar gontractau tymor byr neu benodol wedi dod i mewn i helpu yn ystod y pandemig coronafeirws (COVID-19).