Each disability benefit payable under Section 14-123 or 14-124 shall be increased by 7% of the original fixed amount of such benefit on January 1, 1986 or January 1 following the fourth anniversary of the granting of the benefit, whichever occurs later. On each January 1 following the 7% increase, but not earlier than January 1, 1991, the disability benefit shall be increased by 3% of the current amount of the benefit, including prior increases under this Article.
40 ILCS 5/14-125.1