The statistics refer to casualties resulting from personal injury collisions on public roads reported to the police and forwarded to the Welsh Government.
Mae'r ystadegau'n cyfeirio at bobl a gafodd anafiadau personol mewn gwrthdrawiadau ar ffyrdd cyhoeddus y rhoddwyd gwybod amdanynt i'r heddlu ac a anfonwyd ymlaen i Lywodraeth Cymru.