 In the case of the mines, wells, and other natural deposits listed in subsection (b), the allowance for depletion under section 000 shall be the percentage, specified in subsection (b), of the gross income from the property excluding from such gross income an amount equal to any rents or royalties paid or incurred by the taxpayer in respect of the property. Such allowance shall not exceed 00 percent of the taxpayer's taxable income from the property 