(a) There is hereby levied and imposed for the state fiscal year commencing August 1, 1981, a tax of 11 cents per gallon on all gasoline which is sold or used in the State. For each state fiscal year thereafter, the rate of such tax per gallon shall equal the product of:
(1) The tax rate per gallon of gasoline levied pursuant to this section shall not be less than an amount equivalent to 11 cents per gallon;
(2) The tax rate for any fiscal year commencing July 1, 1982, and thereafter shall not be less than the rate for the prior state fiscal year nor more than 1 cent per gallon above the tax rate in effect for the prior state fiscal year; and
(3) The maximum aggregate tax rate shall not exceed an amount equivalent to 11 cents per gallon of gasoline.
(b) The tax shall be collected by and paid to the State but once in respect to any gasoline. Nothing in this section shall be construed to exempt from the tax any distributor of gasoline with respect to gasoline used in making such distribution. The tax shall be collected in the manner hereinafter provided.
(c) Notwithstanding subsection (a) of this section, the tax levied and imposed in subsection (a) of this section shall be 22 cents per gallon through December 31, 1994. Thereafter, the tax shall be 23 cents per gallon. Effective January 1, 1995, the tax shall be no more or no less than 23 cents per gallon until increased or decreased by the State. By virtue of the pledge and assignment of motor fuel tax revenues by the State to the Delaware Transportation Authority, said tax shall not be decreased during the period any bonds of that Authority are outstanding and unpaid.