Each municipality or county shall have one vote for each five thousand dollars it has contributed to the authority in the form of moneys or property. When property is contributed, the contributing municipality or county court and the authority shall agree in writing at the time the contribution is made as to the fair market value of such property, which valuation shall determine the number of votes to be allocated to the municipality or county on the basis thereof. For the fiscal year during which any authority is formed, the number of votes to which any municipality or county shall be entitled shall be determined as of the time of formation of the authority and shall govern until the end of that fiscal year, even though additional moneys or property are contributed during that fiscal year. Thereafter, the number of votes shall be determined at the end of each fiscal year and such determination shall govern for the ensuing fiscal year, even though additional moneys or property are contributed during that fiscal year. Subsequent to its formation, any authority may permit any municipality or county without this state to participate in the affairs of the authority, to appoint members of the authority in the same manner, and to have such vote or votes beginning as of the next ensuing fiscal year, as prescribed by law with respect to the original participating municipalities or counties or any combination thereof.