Article X
Sec. 21: The total amount of taxes assessed against property for all purposes in any one year shall not exceed one and one-half per cent of the assessed valuation of said property, except taxes levied for the payment of interest and principal on obligations heretofore incurred, which sums shall be separately assessed in all cases: Provided, that this limitation may be increased for a period of not to exceed five years at any one time, to not more than a total of five per cent of the assessed valuation, by a two-thirds vote of the electors of any assessing district, or when provided for by the charter of a municipal corporation: Provided further, that this limitation shall not apply to taxes levied in the year 1932.