Commonwealth Consolidated Acts Commonwealth Consolidated ActsIf the all groups consumer price index number for the weighted average of the 6 State capital cities published by the Statistician in respect of the March quarter of the year 1975 exceeds the all groups consumer price index number for the weighted average of the 6 State capital cities published by the Statistician in respect of the March quarter of the year 1974 a person to whom a pension benefit was payable immediately before 1 July 1975 is entitled to an increase, as ascertained in accordance with section 20 or 21, in the amount of the annual pension benefit that was payable to him immediately before that date .