For all workers' compensation claims under policies written in the three years immediately preceding the date as of which the statement is made, the reserve required by § 58-26-31 shall be calculated in accordance with the Annual Statement Instructions Manual prescribed by the National Association of Insurance Commissioners as adopted by rule by the director pursuant to chapter 1-26. But in any event, the reserve may not be less than the present value at four percent interest of the determined and the estimated unpaid compensation claims under policies written during the three-year period.
SDCL 58-26-32