The records and accounts required under Section 20225 shall not include the contributions made by the state or contracting agencies with respect to the survivor allowances provided for in Article 3 (commencing with Section 21570) of Chapter 14. The board shall keep additional records and accounts with respect to those contributions as will show at any time the accumulated contributions of the state and of contracting agencies held to meet the obligation of the state and of the contracting agencies, respectively, on account of survivor allowances.