Each year, a school district with its home office located in a county that has (i) a population density of ten or fewer persons per square mile according to the 2000 census of population; (ii) an international border; and (iii) more than one school district within its boundaries, may levy for the net operational costs of a swimming pool. The levy may not exceed the net actual costs of operation of the swimming pool for the previous year. Net actual costs are defined as operating costs less any operating revenues and less any payments from other local governmental units.