(a) Due consideration must be given to past and prospective loss and expense experience within and outside this state, to catastrophe hazards and contingencies, to events or trends within and outside this state, to loadings for leveling rates over a period of time, to dividends or savings to be allowed or returned by insurers to their policyholders, members, or subscribers, and to all other relevant factors. All submissions for rate changes or supplementary rate changes must include this information with Arkansas experience shown as well as companywide experience for the past five (5) years for the class of business which this filing affects. The determination of the weighting of credibility assigned to Arkansas must be fully explained. If, within a particular class, the data is not sufficiently credible for Arkansas or companywide, and common classes are grouped together for rate-making purposes, all class codes utilized in developing credibility shall be shown as an exhibit in the filing, with Arkansas experience for each class affected shown separately. If significant trends within the state are utilized, a narrative describing the basis of the trend must be included.

(b) Risks may be classified in any reasonable way for the establishment of rates, except that no risks may be grouped by classifications based in whole or in part on race, color, creed, or national origin of the risk.

(c) The expense provisions included in the rates to be used by any insurer shall reflect the operating methods of the insurer and its actual and anticipated expense experience.

(d) The rates may contain provisions for contingencies and an allowance permitting a reasonable profit. In determining the reasonableness of the profit, consideration must be given to all investment income attributable to premiums and to the reserves associated with those premiums and to loss reserve funds.