There was a 15% decrease in child casualties (aged under 16) and a 16% fall in young person casualties (aged 16-24), compared with 2016.
Bu gostyngiad o 15% yn nifer y plant (o dan 16 oed) a anafwyd, a gostyngiad o 16% mewn pobl ifanc (16-24 oed) a anafwyd, o’i gymharu â 2016.