(a) Premium rates shall not be inadequate, excessive, or unfairly discriminatory.

(b) Rates are excessive if in the aggregate they are likely to produce a long run profit that is unreasonably high in relation to the risk of the class of business, or if expenses are unreasonably high in relation to the services rendered.

(c) Rates are inadequate if they are clearly insufficient, together with investment income attributable to them, to sustain projected losses and expenses, or if the continued use of such fees will unfairly have the effect of substantially lessening competition or of tending to create a monopoly.

(d) Premium rates are unfairly discriminatory if the premium charged for any classification is not reasonably related to the services performed or the risks assumed by the insurer, provided within rate classifications premiums may, to a reasonable degree, be less in the case of smaller insurances and the excess may be charged against larger insurances, without rendering the rate unfairly discriminatory.

(e) In making or reviewing rates, due consideration shall be given to past and prospective loss experience, to exposure to loss, to underwriting practice and judgment, to past and prospective expenses including amounts paid to or retained by title agents, to investment income, to a reasonable margin for profit and contingencies, and to all other relevant factors both within and outside of this state. A five-year experience period is required for all filings of rates, provided the filing of any insurer in existence less than five years shall be supported by experience consistent with the period of its existence.

(f) The commissioner may adopt regulations, in accordance with chapter 54, setting forth guidelines for the evaluation of rates. Such regulations may include consideration of (1) costs of underwriting risks assumed by the insurer, (2) amounts paid to or retained by title agents, (3) operating expenses of the insurer other than underwriting and claims expenses, (4) payment of claims and claim related expenses, (5) investment income, (6) reasonable profit, (7) premium taxes and (8) any other factors the commissioner deems relevant.