The aggregate amount of such district bonded indebtedness, including indebtedness authorized under ORS 328.213, shall not exceed the following percentages of real market value of all taxable property within the district, computed in accordance with ORS 308.207:
(1) For each grade from kindergarten to eighth for which the district operates schools, fifty-five one-hundredths of one percent (0.0055) of the real market value.
(2) For each grade from the 9th to 12th for which the district operates schools, seventy-five one-hundredths of one percent (0.0075) of the real market value.