 General revaluations are to redistribute the total rates liability fairly amongst ratepayers according to the prevailing rental levels of the properties they occupy.Prior to 1999, revaluations were normally carried out every three years or longer.Since 1999, general revaluations have been conducted on an annual basis to ensure that all rateable values in the valuation list are up-to-date and rates are charged equitably according to prevailing market rentals.