For 16 to 18 year olds, the proportion increased slightly between 2008 and 2012, and has fluctuated at around 89-90% in recent years.
Ar gyfer pobl ifanc 16 i 18 oed, cynyddodd y gyfran ychydig rhwng 2008 a 2012, ac mae wedi amrywio ar tua 89-90% yn ystod y blynyddoedd diwethaf.