On the basis of regular interest and such tables as the board of trustees shall adopt, the actuary shall make a valuation, at least once in each two-year period, of the assets and liabilities of the funds of the retirement system.
Biennial evaluation of assets and liabilities of funds
Tenn. Code Ann. § 8-34-506, under Actuarial Services.
Tenn. Code Ann. § 8-34-506