The holders of participating policies issued by a company transacting life insurance are entitled to share in that portion of the profits set apart that has been distinguished as having been derived from such class of policies to the extent of at least:(a) 90% of such profits in any year in which the average of the participating fund does not exceed $250,000,000;
(b) 92 1/2% of such profits in any year in which the average of the participating fund exceeds $250,000,000 but does not exceed $500,000,000;
(c) 95% of such profits in any year in which the average of the participating fund exceeds $500,000,000 but does not exceed $1,000,000,000; and
(d) 97 1/2% of such profits in any year in which the average of the participating fund exceeds $1,000,000,000.