Ohio Rev. Code Ann. § 3929.59

Thirty per cent of all mine subsidence insurance premiums collected by each insurer for policies delivered, issued for delivery, or renewed in a county designated for optional coverage in accordance with division (A)(2) of section 3929.56 of the Revised Code, excluding premiums collected under such policies for mine subsidence insurance coverage which is not reinsured by the mine subsidence insurance underwriting association, shall be retained by the insurer as a ceding commission. The remainder of such premiums shall be remitted by the insurer to the mine subsidence insurance underwriting association.