In addition to any salary, fees, or expenses now or hereafter provided by law, the governing authority of each county is authorized to provide as contingent expenses for the operation of the office of sheriff, and payable from county funds, a monthly expense allowance of not less than the amount fixed in the following schedule:

Population Minimum_Monthly_Expenses 0 -- 11,889..........................................$ 100.00 11,890 -- 74,999.......................................... 200.00 75,000 -- 249,999.......................................... 300.00 250,000 -- 499,999.......................................... 400.00 500,000 or more.............................................. 500.00