Insurers shall be subject to taxation according to the provisions of Title 32; provided, however, that no tax shall be due or payable as to considerations received for annuity contracts. Payment by an insurer of the tax as in Title 32 required shall be in lieu of all taxes imposed by the State upon premiums or upon income, and of franchise, privilege or other taxes measured by income of the insurer. The provisions of this section shall not be modified or repealed by any law of general application hereafter enacted unless expressly referred to or expressly repealed therein. (Added 1967, No. 344 (Adj. Sess.), § 1 (ch. 2, subch. 1, § 18).)