Notwithstanding anything to the contrary in this article, the monthly allowance for service credited under the Second Tier shall be adjusted annually beginning with the second calendar year following retirement for time commencing on April 1 and payable on the first day of May. The adjusted monthly allowance shall be equal to the base allowance increased by 3 percent per year compounded for the number of years intervening between the end of the base year and the beginning of the calendar year in which the adjustment is made.