Ind. Code § 5-10.2-5-4

Sec. 4. Cost of Living Increases. As a cost of living increase, the retirement, disability, and survivor benefit payable on and after July 1, 1976, to a member, or beneficiary or survivor of a member, who retired before July 2, 1975, shall be increased by three percent (3%). However, the benefit may not be increased by an amount less than seven dollars ($7.00) per month nor more than fifteen dollars ($15.00) per month. This section does not apply to benefits payable in a lump sum.