46% of the total number of pupils attended at least one session (based on the number of pupils in each local authority minus those in years 11 and 13 who are much less likely to attend).
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).