The published figures provided are compiled by professional analysts using the latest available data and applying methods using their professional judgement and analytical skillset.
Lluniwyd y ffigurau a gyhoeddwyd gan ddadansoddwyr proffesiynol gan ddefnyddio’r data diweddaraf sydd ar gael a chymhwyso dulliau gan ddefnyddio eu barn broffesiynol a’u sgiliau dadansoddi.