For those school districts with a basic education certificated instructional staff ratio of less than forty-six, the superintendent shall reduce the district's basic education general apportionment entitlement for the school year by the amount determined as follows:

(1) Subtract the current school year final basic education certificated instructional staff ratio as reported to the school district from forty-six;

(2) Multiply the result obtained in subsection (1) of this section by the current school year full-time equivalent enrollment and further divide by one thousand; and

(3) Multiply the result obtained in subsection (2) of this section by the school district's average salary, average mandatory fringe benefits, and health insurance benefits per certificated instructional staff unit used for the purpose of calculating the school district's general apportionment entitlement for the current school year.