1. All cities of the fourth class in this state may by city ordinance levy and impose annually for municipal purposes upon all subjects and objects of taxation within such cities a tax which shall not exceed the maximum rate of one dollar on the one hundred dollars assessed valuation.
2. The maximum rate of taxation for general municipal purposes may be increased for not to exceed four years at any one time when the rate and purpose of such increase are submitted to a vote and two-thirds of the voters voting thereon vote in favor of the increase, but the increase so voted shall be limited to a maximum rate of taxation not to exceed thirty cents on the one hundred dollars assessed valuation. The board of aldermen of such cities may submit the question, and the question shall be submitted by the board of aldermen when petitioned therefor by voters equaling in number five percent or more of the voters of such cities voting for mayor at the last election at which a mayor was elected.
3. The question shall be submitted in substantially the following form:
4. If the increase in levy is voted, the increased levy shall be effective for the number of years designated, and no longer, but such cities through their boards of aldermen may submit proposals for continuing the increase of levy at any time for like periods not to exceed four years each.