The county may, from time to time, issue its bonds in an aggregate principal amount the county determines necessary to provide sufficient funds for purposes of advancing moneys representing uncollected taxes in accordance with Section 4705 of the Revenue and Taxation Code, provided that the aggregate amount of all the bonds issued in any fiscal year, together with interest thereon, shall not exceed the tax revenues attributable to the fiscal year in which the bonds are issued, except that in the case of a county wishing to finance the initial apportionment pursuant to Section 4713 of the Revenue and Taxation Code, the aggregate principal amount of bonds that may be issued for that purpose, together with interest thereon, shall not exceed the aggregate amount of those initial apportionments plus any then-existing delinquent penalties.