Each county treasurer shall receive for and on behalf of the county for services rendered to other governmental subdivisions and agencies, when fees for services rendered by him or her are not otherwise specifically provided, the following fees:
(1) On all sums of money collected by him or her for each fiscal year, two percent of the sums so collected;
(2) for the collection of all sums of money, general or bonded, of drainage, irrigation, or natural resources districts, one percent of the sums so collected;
(3) for the collection of all sums of money for municipal taxes, general or special, including money for bond sinking fund or bond interest fund and school money, one percent of the sums so collected; and
(4) for the collection of all sums of money for special assessments for municipal improvements, one and one-half percent of the sums so collected. On all sums collected, such percentage shall be allowed but once. In computing the amount collected for the purpose of charging percentage, all sums from whatever fund derived shall be included together, except the school fund. The treasurer shall be paid in the same proportion from the respective funds of the state collected by him or her whether the funds are in money or state warrants.