However, projecting known commitments for the period from 2019 to 2029, we estimate shortfalls of between £2.4bn and £5.1bn.
Fodd bynnag, gan ragamcanu’r ymrwymiadau y gwyddys amdanynt ar gyfer y cyfnod rhwng 2019 a 2029, rydym yn amcangyfrif y diffygion i fod rhwng £2.4 biliwn a £5.1 biliwn.