46% of the total number of pupils attended at least one session (based on the total number of pupils in each local authority except those in years 11 and 13)
46% o’r holl ddisgyblion wedi mynycho o leiaf un sesiwn (wedi’i selio ar nifer y disgyblion fesul awdurdod heblaw’r rhai ym mlynyddoedd 11 a 13).