76-1-203. Term of members of county and city-county planning boards. The terms of the members who are officers of any governmental unit represented on the board shall be coextensive with their respective terms of office to which they have been elected or appointed; the terms of the other members shall be 2 years, except that the terms of the first members appointed shall be fixed by agreement and rule of the governing bodies represented on the board for 1 or 2 years in order that a minimum number of terms shall expire in any year.