The Council of the City must, after each recurring Federal Census, and within six (6) months after the issuance of a proclamation of population by the Secretary of State of the State of Ohio, redivide the existing wards of the City into as nearly equally populated wards as practicable using existing corporate lines. Immediately after the taking effect of this Charter, the Council shall proceed to have the City divided into four (4) wards as nearly equal in population as practicable.