As a result the rent for the years after year 5 also need to be changed as the highest rent in the first 5 years is now that paid in year 4 rather than the previous estimate used for year 5.
Felly er mwyn cyfrifo newidiadau cronnol dros amser, byddai’n well i gyfrifo newidiadau canrannol am y flwyddyn ddiweddaraf yn erbyn blwyddyn ynghynt.