; and (ii) the Administrator shall provide the policyholder a refund equal to the amount of— (I) any premiums that the policyholder paid during the year described in clause (i); and (II) any premiums that the policyholder paid for flood insurance coverage that the policyholder was required to purchase or maintain during the 2-year period preceding the year described in clause (i). (B) Partially successful appeals If the Administrator determines in an appeal under this subsection that mitigating factors have reduced, but not eliminated, the risk of flooding to a property, the Administrator shall— (i) reduce the amount of flood insurance coverage required to be maintained for the property by the ratio of the successful portion of the appeal as compared to the entire appeal; and (ii) provide the policyholder a refund equal to the difference between— (I) the amount of any premiums that the policyholder paid during the period— (aa) beginning on the later of— (AA) the date on which the mitigating factor was created; or (BB) January 1 of the second year preceding the date on which the determination is made; and (bb) ending on the date on which the reduction in the amount of flood insurance required, as described in clause (i), takes effect