Sec. 4.025. CITY OR MEMBER CONTRIBUTIONS IF NO UNFUNDED ACTUARIAL LIABILITIES. Notwithstanding Section 4.02 or 4.03 of this article, if the pension system has no unfunded actuarial liability according to the most recent actuarial valuation, the annual normal costs must be equally divided between the city and the members unless equally dividing the costs would increase the member contribution rates beyond the rates prescribed by Section 4.03 of this article. The board shall adjust the city contribution rates under Section 4.02 of this article and the member contribution rates under Section 4.03 of this article accordingly, and certify the adjusted rates. After the completion of a subsequent actuarial valuation showing unfunded actuarial liabilities, the contribution rates applicable under Sections 4.02 and 4.03 of this article apply.