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 the State of Alabama, an increase of the ad valorem tax presently being levied in the City of Arab, Alabama, pursuant to the general provisions of the constitution and laws of the State of Alabama from the rate of fifty cents ($0.50) on each one hundred dollars ($100) worth of taxable property in the city to the rate of one dollar forty-five cents ($1.45) on each one hundred dollars ($100) worth of taxable property in the city (an increase of ninety-five cents ($0.95) on each one hundred dollars ($100) worth of taxable property, or nine and one-half mills) is approved; such additional nine and one-half mill tax to be levied and collected for each year beginning with the levy for the tax year October 1, 1991, to September 30, 1992 (the tax for which year will be due and payable October 1, 1992), and ending with the levy for the tax year October 1, 2020, to September 30, 2021 (the tax for which year will be due and payable October 1, 2021), and to be used by the city board of education of the City of Arab 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.