Members of the city planning commission shall hold office for a term of three (3) years with the exception that in the first instance two (2) shall be appointed to serve a term of one year, two (2) for a term of two (2) years and one appointed for a term of three (3) years; appointments thereafter shall be made for a term of three (3) years, except when a vacancy occurs when the appointment shall be made to fill the unexpired term. (Prior Code, Sec. 13-2)