The actuary shall cause to be published, as of the date of the investigation and valuation made pursuant to Section 20131, a financial statement showing an actuarial valuation of the assets and liabilities of this system and a statement as to the accumulated cash and securities in the retirement fund as certified by the Controller. The actuary may omit from the statement, which shall be published as of July 1 of every other year, assets and liabilities resulting from prior service, and shall include assets and liabilities on account of current service in amounts equal only to accumulated contributions held on account of that service.