All net revenues derived from operation of the state warehouse system must be transferred annually to a special account in the State Treasury until the sum of three million dollars accrues. When the fund reaches three million dollars, these transfers shall cease; however, all interest and investment revenue shall accrue solely to the fund and be returned annually to the fund. In order to support the increase of this fund, the funds must be invested at interest by the State Treasurer who shall credit the interest earned on the funds to the increase of the fund up to and above three million dollars. In addition to the interest, the commissioner shall assess an amount ratably against each warehouseman in this State issuing warehouse receipts a special additional fee not to exceed ten cents a bale of cotton or one cent a bushel of soybeans and one-half cent a bushel of any other stored feed grains or oil seeds for which warehouse receipts have been issued. The additional assessment may be charged not more than once for each receipt issued on a bale of cotton or bushel of grain. When the fund has reached the total sum of one million five hundred thousand dollars, the special additional assessment must be discontinued. If the fund is reduced to below one million dollars, the assessment must be resumed. The funds must be used to guarantee state warehouse receipts in excess of an amount recovered from the bonds required by this chapter, and to protect and reimburse depositors against losses as defined in § 39-22-15. If there is an insufficient amount of money in the fund to cover all claims against the fund, payments must be made on a pro rata basis up to one hundred percent of the total loss of each claimant. If payment is not received in the amount of one hundred percent, then additional amounts must be paid as funds become available until payment of one hundred percent of the total is attained. The state’s guarantee of warehouse receipts is based on monies available through the required bonds and the fund. Upon approval of a claim to the fund and before payment from the fund, the claimant shall subrogate his interest, if any, to the department in a cause of action against all parties relating to the claim. In no event may the funds be available for the reimbursement of an insurer or surety on the bonds required by this chapter, Chapter 19 of this title, or Chapter 7 of Title 36, who has paid a loss under this chapter. All income, interest, or otherwise, derived from this guaranty fund must be reinvested in the fund. Fifty thousand dollars of the income must be paid into the general fund of the State. Any of the funds not appropriated for the employment of additional auditors for the warehousemen and Dealers and Handlers Division of the Department of Agriculture must be returned to the fund.