Between March and October 2020 median waits more than doubled to over 29 weeks, before falling sharply up to June 2021.
Rhwng mis Mawrth a mis Hydref 2020 fe wnaeth arosiadau canolrifol fwy na dyblu i dros 29 wythnos, cyn gostwng yn sydyn hyd at fis Mehefin 2021.