In addition to any taxes now authorized or that may hereafter be authorized by the constitution and laws of the State of Alabama, pursuant to Amendment 373 to the Constitution of Alabama of 1901, an increase of the ad valorem tax presently being levied in the City of Vestavia Hills, Alabama, pursuant to the constitution and laws of the State of Alabama, including the election held in the city on April 28, 1970, from the rate of one dollar fifty-one cents on each one hundred dollars worth of taxable property in the city to the rate of two dollars fifty-six cents on each one hundred dollars worth of taxable property in the city (an increase of one dollar five cents on each one hundred dollars worth of taxable property, or 10 and one-half mills) is approved; such additional 10 and one-half mill tax to be levied and collected for each year beginning with the levy for the tax year October 1, 1989, to September 30, 1990, (the tax for which year shall be due and payable October 1, 1990) and ending with the levy for the tax year October 1, 2016, to September 30, 2017, (the tax for which year shall be due and payable October 1, 2017), and to be used by the City Board of Education of the City of Vestavia Hills for public school purposes; provided, that the aforesaid increased rate of such tax, the time it is to continue, and the purpose thereof shall have been first submitted to the vote of the qualified electors of the city, and voted for by a majority of those voting at a special election called and held in accordance with the law governing special elections.