All insurers which are members of the association shall participate in its writings, expenses, profits, and losses in the proportion that the net direct premium of each member, excluding that portion of premiums attributable to the operation of the association, written during the preceding calendar year bear to the aggregate net direct premiums written in this State by all members of the association. Each insurer‘s participation in the association must be determined annually on the basis of the net direct premiums written during the preceding calendar year, as reported in the annual statements and other reports filed by the insurer with the department of Insurance. No member may be obligated in any one year to reimburse the association because of its proportionate share in the deficit from operations of the association in that year in excess of one percent of its surplus to policyholders and the aggregate amount not so reimbursed must be reallocated among the remaining members in accordance with the method of determining participation prescribed in this subsection after excluding from the computation the total net direct premiums of all members not sharing in the excess deficit. If the deficit from operations allocated to all members of the association in a calendar year exceeds one percent of their respective surplus to policyholders, the amount of the deficit must be allocated to each member in accordance with the method of determining participation prescribed in this subsection.