Section 8A. A petition filed or approved by the voters of a city or town, or the mayor and city council or other legislative body of a city, or the town meeting or other legislative body of a town, for submission to the general court pursuant to the provisions of Section 8 of Article LXXXIX of the Amendments to the Constitution of the Commonwealth shall indicate the number voting in favor of such filing or approval and the number opposed, if such vote is tabulated.