Any surplus in excess of all reserves established by the directors of the corporation and shown in the annual report of a corporation may be used by the corporation for the following purposes in the order of priority shown:
(1) To liquidate on a pro rata basis any losses incurred by hospitals, physicians, and surgeons, or other similar institutions or persons, upon the settlement of bills with the corporation in any previous years;
(2) To return the original working capital contribution to the corporation, or any part thereof, on a pro rata basis; and
(3) To reduce rates charged subscribers or to expand the services rendered to them.