(a) At least once each year each service corporation shall make a special accounting, at which time any prorated settlements for bills submitted by participant providers or hospitals for services rendered during the preceding calendar year shall be adjusted, and any deficits made up on a uniform basis as to all participants to the extent of funds available.
(b) Funds of the service corporation remaining after the annual accounting, and after adequate provision for all its liabilities and reserves, and for the surplus fund required under AS 21.87.210, may be used by the corporation, upon express authorization by its board of directors, for any of the following purposes:
(1) to liquidate on a uniform and pro rata basis charges for services by participant providers or participant hospitals not paid in full upon the settlement of bills in previous years;
(2) to pay off any part or the whole of an outstanding contribution of working capital to the corporation, the payment to be prorated on a uniform basis among all the outstanding contributions; or
(3) to reduce the rates thereafter to be charged subscribers, or to expand the services or benefits thereafter to be provided under subscription contracts.