RBC Instructions, RBC Reports, Adjusted RBC Reports, RBC Plans, and Revised RBC Plans are intended only for use by the director in monitoring the solvency of insurers and in monitoring the need for corrective action. They must not be used for ratemaking, considered or introduced as evidence in any ratemaking proceeding, or used to calculate or to derive any elements of an appropriate premium level or rate of return for any line of insurance which an insurer, an affiliated insurer, or a subsidiary insurer underwrites.