The valuation of the reserves on the policies and bonds of every life insurance company incorporated by the laws of this State shall be based upon any recognized standard of valuation and mortality table as the Commissioner should deem best for the security of the business and the safety of the persons insured. The Commissioner shall annually value or cause to be valued the reserves on all policies and annuities of each domestic company and may accept the valuation of such reserves made by the company upon such evidence of its correctness as he may require. Upon this valuation being made by the Commissioner and a certificate thereof furnished by him, each company shall pay to such officer, to defray the expenses thereof, the sum of one cent (1?) for every thousand dollars ($1,000) of the whole amount insured by its policies so valued. The reserve fund hereinbefore provided for shall not be available for or used for any other purpose than the discharge of policy obligations, but is a trust fund to be held and expended only for the benefit of policyholders. In case of the insolvency of the company, the reserve on outstanding policies may, with the consent of the Commissioner, be used for the reinsurance of its policies to the extent of their pro rata part thereof. (1903, c. 536, s. 4; 1905, c. 410; Rev., s. 4777; 1907, c. 1000, s. 7; C.S., s. 6461; 1945, c. 379.)