The director of the State Lottery shall: (1) increase commissions paid to lottery retailers in effect on January 1, 1998, by one-half percent on the price of each ticket sold by each retailer; and (2) provide that each lottery retailer receive a commission of at least one percent on the amount of each winning ticket cashed by that retailer. The director of the State Lottery shall periodically review lottery ticket sales and make such adjustments to lottery retailer commission rates as are deemed necessary to maintain appropriate return to the state.