Tex. Parks and Wildlife Code § 22.025: INTEREST ON BONDS.

Interest on the bonds may not exceed six percent per year, computed with relation to the absolute maturity of the bonds in accordance with standard bond interest tables currently in use by insurance companies and investment houses, excluding from the computation the amount of any premium to be paid on redemption of any bonds prior to maturity.

Acts 1975, 64th Leg., p. 1405, ch. 545, Sec. 1, eff. Sept. 1, 1975.