Fees for guarantees; amount; collection

The Secretary shall charge and collect fees for each guarantee in amounts specified in the commitment to guarantee, which shall be in amounts sufficient in the judgment of the Secretary at the time of issuance of the commitment to guarantee to cover applicable administrative costs and probable losses on the guaranteed obligations covered by the commitment to guarantee, but in any event not to exceed one-half of 1 percent per annum of the outstanding indebtedness covered by each guarantee.