Funds in which assets of the retirement system are to be held

All of the assets of the retirement system shall be credited according to the purpose for which they are held among three funds, to be known as the ‘‘annuity savings fund,’’ the ‘‘pension accumulation fund,’’ and the ‘‘expense fund.’’ (Ga. L. 1943, p. 640, § 8; Ga. L. 1962, p. 723, § 1.)