(2) For the purpose of evaluating the system under this section and for the purpose of issuing reports on the system, the actuary and the board shall determine the unfunded actuarial liability of the system by calculating the difference between the actuarial value of the current and prospective liabilities of the system and the actuarial value of the assets of the system, including any lump sum payments made under ORS 238.229. When reporting on the unfunded actuarial liability in any official documentation or report, the board shall report on the unfunded actuarial liability as determined under this subsection. [Formerly 237.285; 2017 c.746 §12]