Each petition for the nomination of a candidate for the office of Mayor shall be signed by not fewer than one hundred (100) electors of the municipality. Each petition for the nomination of a candidate for an office, other than that of Mayor, filled by election at large shall be signed by not fewer than twenty-five (25) electors of the municipality. Each petition for the nomination of a candidate for an office filled by election from a ward shall be signed by not fewer than ten (10) electors from such ward. (Amended 11-6-79.)