1,011 (23%) were killed or seriously injured (KSI), an increase of 23% compared with 2020 but a decrease of 15% compared to 2019.
Cafodd 1,011 (23%) o’r bobl hynny eu lladd neu eu hanafu’n ddifrifol, cynnydd o 23% o’i gymharu â 2020 ond yn ostyngiad o 15% o’i gymharu â 2019.