The number of deputies allowed the county clerk may not exceed:
(1) six in counties having a taxable valuation of $30 million or more;
(2) three in counties having a taxable valuation of $20 million or more and less than $30 million;
(3) two in counties having a taxable valuation of $10 million or more and less than $20 million;
(4) one in counties having a taxable valuation of less than $10 million.