.05 Loss Ratio.

Benefits for policies issued under these regulations shall be deemed reasonable in relation to premiums if claims incurred under the policies result in, or may reasonably be expected to result in, a loss ratio of not less than 55 percent when premiums do not exceed prima facie premium rates. When the prima facie loss ratio exceeds 55 percent, the premiums shall be determined in accordance with the methods of Regulation .18 of this chapter.