The rural fire district may increase the total amount of revenue payable from taxes on real property in any year up to the maximum amount calculated in accordance with § 10-13-35.8 utilizing any unused index factor or reduced amount of revenue payable from property taxes for the prior three years. However, such an amount may not exceed the prior three year index factor total or ten percent, whichever is less.
SDCL 10-13-35.9