For the fiscal year commencing October 1, 1982, and ending September 30, 1983, the payment to each eligible county shall be 100 percent of its net revenue loss, or difference between base year net revenue and projected revenue; and for each of the three succeeding fiscal years thereafter, 100 percent of its net revenue loss.
The board shall pay the subsidy to each eligible county on the 15th day of the months of March, June and September of each year an amount equal to one-third of the total annual subsidy payment to be made during that fiscal year; provided, should the fund not contain sufficient money to make any given payment, any deficiency shall be made up in the next succeeding payment or payments.
Ala. Code § 28-3-196 (1975)