(1) The salaries of the members of the boards of supervisors of the various counties are fixed as full compensation for their services.

(a) For counties having a total assessed valuation of less than Thirty Million Dollars ($30,000,000.00), a salary of Twenty-nine Thousand Eight Hundred Seventy Dollars ($29,870.00);

(b) For counties having a total assessed valuation of at least Thirty Million Dollars ($30,000,000.00), but less than Fifty Million Dollars ($50,000,000.00), a salary of Thirty-three Thousand Two Hundred Sixty-nine Dollars ($33,269.00);

(c) For counties having a total assessed valuation of at least Fifty Million Dollars ($50,000,000.00), but less than Seventy-five Million Dollars ($75,000,000.00), a salary of Thirty-four Thousand Seven Hundred Eleven Dollars ($34,711.00);

(d) For counties having a total assessed valuation of at least Seventy-five Million Dollars ($75,000,000.00), but less than One Hundred Twenty-five Million Dollars ($125,000,000.00), a salary of Thirty-five Thousand Seven Hundred Forty-one Dollars ($35,741.00);

(e) For counties having a total assessed valuation of at least One Hundred Twenty-five Million Dollars ($125,000,000.00), but less than Three Hundred Million Dollars ($300,000,000.00), a salary of Forty-one Thousand Six Hundred Twelve Dollars ($41,612.00);

(f) For counties having a total assessed valuation of at least Three Hundred Million Dollars ($300,000,000.00), but less than One Billion Dollars ($1,000,000,000.00), a salary of Forty-six Thousand Forty-one Dollars ($46,041.00);

(g) For counties having a total assessed valuation of One Billion Dollars ($1,000,000,000.00), but less than Two Billion Dollars ($2,000,000,000.00), a salary of Forty-seven Thousand Seventy-one Dollars ($47,071.00);

(h) For counties having a total assessed valuation of Two Billion Dollars ($2,000,000,000.00) or more, a salary of Forty-eight Thousand One Hundred One Dollars ($48,101.00).

(2) The annual salary established for the members of the board of supervisors shall not be reduced as a result of a reduction in total assessed valuation.

(3) The salary of the members of the board of supervisors shall not be increased under this section until the board of supervisors shall have passed a resolution stating the amount of the increase and spread it on its minutes.