A. As used in this amendment the following terms shall be given the following respective meanings:
"County" means Mobile county.
"Special tax" means the annual ad valorem tax at the rate of 1/2 of 1 per centum (equivalent to 5 mills on each dollar) of the assessed valuation of the taxable property in the county authorized to be levied by the county by the amendment known as amendment XVIII  to the Constitution of Alabama, as amended by the amendment to the Constitution known as amendment CLII , and also provided for in the amendments to the Constitution known as amendments C , CXII , CLI , CXCIII , and CXCV .
B. Commencing with the levy for the tax year beginning October 1, 1969 (for which tax year the special tax will become payable on October 1, 1970) the special tax shall be levied annually by the governing body of the county on the assessed valuation of all property subject to taxation by the county, as assessed for state taxation for the next preceding year, at the following rates for the following respective purposes:
(a) 1/2 mill on each dollar (equivalent to 1/20 of 1%) of the said assessed valuation shall be levied for the general purposes of the county to be paid into and disbursed by the governing body of the county out of the general fund of the county; and
(b) 4 1/2 mills on each dollar (equivalent to 9/20 of 1%) of the said assessed valuation shall be levied for payment of the principal of and interest on all bonds of the county heretofore and hereafter issued that are payable out of or secured by a pledge of the special tax; provided, that the said rate of 4 1/2 mills on each $1.00 of the said assessed valuation shall be reduced for each tax year for which the special hospital tax authorized in paragraph G of the amendment to the Constitution known as amendment No. CXCV  shall have been levied at a rate exceeding 1 mill on each dollar of the taxable property in the county, any such reduction to be by 1/2 mill on each dollar of the assessed valuation of the taxable property in the county or by rate of millage equal to the rate by which the said special hospital tax levied for that tax year exceeds one mill on each dollar of the assessed valuation of such taxable property, whichever shall be the lesser reduction.