Any member of the Teachers' Retirement System of Oklahoma, who taught kindergarten on public school property prior to the state-supported kindergarten, and who subsequently taught in the public schools and has met the necessary qualifications, may receive credit in the System for such teaching service by, prior to January 1, 1991, making back contributions of ten percent (10%) of salary plus ten percent (10%) interest to the System as required by the Board of Trustees. Effective January 1, 1991, to receive the credit in the System for such teaching service, the member shall pay the amount determined by the Board of Trustees pursuant to Section 17-116.8 of this title.