Since then, median waiting times have increased alongside increasing attendances and reached a record high for the second consecutive month in June 2021.
Ers hynny, mae canolrif yr amseroedd aros wedi cynyddu ochr yn ochr ag ymweliadau cynyddol, ac roeddent ar eu lefel uchaf erioed am yr ail fis o’r bron ym mis Mehefin 2021.