(1) Upon the liquidation of a domestic mutual insurer, its assets remaining after discharge of its indebtedness and policy obligations shall be distributed to its members who were such within the thirty-six months prior to the last termination of its certificate of authority.

(2) Upon the reorganization of a domestic mutual insurer as a domestic stock insurer under RCW 48.09.350(1) or upon reinsurance of the whole of the liabilities and transfer of all the assets of a domestic mutual insurer under RCW 48.09.350(2), the ownership equities of members of the domestic mutual insurer shall be distributed to its members who were such on an eligibility date stated in the reorganization plan or reinsurance agreement, or who were such within the thirty-six months prior to such eligibility date. Such eligibility date shall be either the date on which the reorganization plan or reinsurance agreement is adopted by resolution of the board of directors of the domestic mutual insurer, or the date on which the reorganization plan or reinsurance agreement is approved by a vote of the members, or the date which ends a calendar quarter during which either of such actions is taken.

(3) Upon the liquidation of a domestic mutual insurer, the distributive share of each such member shall be in the proportion that the aggregate premiums earned by the insurer on the policies of the member during the thirty-six months before the last termination of the insurer's certificate of authority, bear to the aggregate of all premiums so earned on the policies of all such members during the same thirty-six months.

(4) Upon the reorganization of a domestic mutual insurer as a domestic stock insurer under RCW 48.09.350(1) or upon reinsurance of the whole of the liabilities and transfer of all the assets of a domestic mutual insurer under RCW 48.09.350(2), the distributive share of each member entitled thereto shall be in the proportion that the aggregate premiums earned by the insurer on the policies in force of that member during the thirty-six months before the eligibility date established under RCW 48.09.360(2) bear to the aggregate of all premiums so earned during the same thirty-six months on all the policies in force of all such members who are entitled to a distributive share.

(5) If a life insurer, the insurer shall make a reasonable classification of its life insurance policies so held by such members entitled to a distributive share and a formula based upon such classification for determining the equitable distributive share of each such member. Such classification and formula shall be subject to the commissioner's approval.