For the purpose of maintaining such guaranty fund the city shall each year levy upon all of the taxable property in the LID such sums as may be necessary to meet the financial requirements of the fund; provided, that the sums so levied in any year shall not be more than sufficient to pay the outstanding warrants on the fund and to establish therein a balance which, combined with the levy in any one year, shall not exceed five percent of the outstanding obligations thereby guaranteed. (Ord. 1337, §26, 1980).