For example, Bridgend has risen from third lowest to second highest, while Caerphilly has fallen from second highest to twelfth highest.
Er enghraifft, mae Pen-y-bont ar Ogwr wedi codi o'r trydydd isaf i'r ail uchaf, tra bod Caerffili wedi cwympo o'r ail uchaf i'r deuddydd uchaf.