In addition to amounts resourced and computed by the education resource block grant model and amounts reimbursed under W.S. 21-13-320 and 21-13-321, the department of education shall reimburse each school district for retirement benefits equal to the percentage paid for state employee members under W.S. 9-3-413 and 9-3-413.1, but only for those employees' salaries paid from amounts specified by W.S. 21-13-309.1, 21-13-320 or 21-13-321. If a portion of an employee's total salary is paid from funds other than those amounts specified by W.S. 21-13-309.1, 21-13-320 or 21-13-321, only the proportional amount shall be subject to reimbursement. The department shall promulgate rules regarding employee eligibility for reimbursement under this section and the information required from school districts to reimburse retirement benefit costs under this section. The department shall reimburse the amount computed under this section to each school district monthly or in accordance with the schedule provided under W.S. 21-13-313(c).