The amount of any self-liquidating bonds issued under ORS § 225.360 shall not be within any limitation of indebtedness fixed by law or charter, but shall be in addition to the amount of the bonds within the limitation. However, the aggregate of the bonds, after deducting sinking funds applicable to payment of principal of the bonds, shall not exceed two and one-half percent of the latest real market value of the issuing city. [Amended by 1967 c.293 § 27; 1981 c.804 § 74; 1991 c.459 § 355]