Illinois Statutes Chapter 40. Pensions § 5/14-138. Actuary

(a) at least once every 3 years, make a general investigation of the mortality, retirement, disability, employment, turnover, interest and earnable compensation;

(b) recommend tables to be used for all required actuarial calculations;

(c) make an annual valuation of the liabilities and reserves of the system, make an annual determination of the amount of contributions required from the State under this Article, and certify the results thereof to the board; and

(d) perform such other duties as the board may assign.