Prior to the COVID-19 pandemic, performance against both referral to treatment targets was fairly stable between 2016 and early 2019, but had been deteriorating since mid-2019.
Cyn pandemig COVID-19, roedd y perfformiad yn erbyn y ddau darged amser rhwng atgyfeirio a thriniaeth yn weddol sefydlog rhwng 2016 a dechrau 2019, ond roedd wedi bod yn dirywio ers canol 2019.