An interlocal risk management pool shall not function as a means of sharing among members of an interlocal risk management agency risks of loss for or from public liability, workers’ compensation, automobile risks, property perils or losses in excess of retentions until the interlocal risk management agency administering such a pool shall have received contributions from members in the amount of one million dollars with respect to a workers’ compensation or an excess risk pool, and two million dollars with respect to a public liability, automobile and property pool, provided in cases where a member has agreed to pay its annual contribution monthly, quarterly or in other installments, the full amount of its annual contribution shall be included in calculating the applicable dollar requirement of this subsection if such first installment has been paid by the time the pool is to commence its risk-sharing function. An interlocal risk management agency which operates an interlocal workers’ compensation risk management pool and a separate hypertension and heart disease pool may function as a means of sharing both such categories of risks after receiving contributions from members in the amount of one million dollars in the aggregate with respect to both such pools.