Sec. 13. If the board determines after a review under section 12 of this chapter that the system has investments in a restricted entity or a restricted investment product, the board shall establish a plan to divest the investment and complete the divestment as soon as financially prudent. However, the investment must be divested not later than the following:
(1) At least fifty percent (50%) of the investment shall be removed from a fund's assets within three (3) years after the board discovers that the investment is in a restricted entity or restricted investment product.
(2) At least seventy-five percent (75%) of the investment shall be removed from a fund's assets within four (4) years after the board discovers that the investment is in a restricted entity or restricted investment product.
(3) One hundred percent (100%) of the investment shall be removed from a fund's assets within five (5) years after the board discovers that the investment is in a restricted entity or restricted investment product.