599—1.6 (101C) Termination of the council. On the council’s own initiative or on petition to the council by retail propane marketers representing 35 percent of the volume of odorized propane sold in this state, the council shall, at its own expense, arrange for a referendum to be conducted by an independent auditing firm agreed upon by the retail propane marketers, to determine whether the council should be terminated or suspended. Voting rights in the referendum shall be based on the volume of odorized propane sold in this state by each retail propane marketer during the previous calendar year. Each retail propane marketer voting in the referendum shall certify to the independent auditing firm the volume of odorized propane sold by that person as represented by that person’s vote. Upon the approval of those retail propane marketers representing more than one-half of the total volume of odorized propane sold in this state, the council shall be terminated or suspended and the general assembly shall consider the repeal of this chapter during its next regular session.