Sec. 41. (a) The pension portion (plus postretirement increases to the pension portion) provided by employer contributions of the monthly benefit payable after December 31, 2006, to a member of the Indiana state teachers' retirement fund (or to a survivor or beneficiary of a member of the Indiana state teachers' retirement fund) who retired or was disabled:
(1) before July 2, 1991, shall be increased by two percent (2%); and
(2) after July 1, 1991, and before July 2, 2004, shall be increased by one percent (1%).
(b) The increases specified in this section:
(1) are based on the date of the member's latest retirement or disability;
(2) do not apply to benefits payable in a lump sum; and
(3) are in addition to any other increase provided by law.