9. The number of electoral districts of a municipality shall be(1) not fewer than 6 nor more than 8 if its population is under 20,000;
(2) not fewer than 8 nor more than 12 if its population is 20,000 or over but under 50,000;
(3) not fewer than 10 nor more than 16 if its population is 50,000 or over but under 100,000;
(4) not fewer than 14 nor more than 24 if its population is 100,000 or over but under 250,000;
(5) not fewer than 18 nor more than 36 if its population is 250,000 or over but under 500,000;
(6) not fewer than 30 nor more than 90 if its population is 500,000 or over.
The population of a municipality is its population on the date of passage, as provided in section 14, of the draft by-law dividing its territory into electoral districts.