(2) For purposes of completing the percentage distribution schedule under ORS 311.390, the tax collector shall treat any additional taxes or penalties charged because of the disqualification of property from special assessment or exemption as having been imposed by the districts within which the property subject to the additional taxes or penalties is located. The amount of additional taxes or penalties attributable to each district shall be determined based on the percentage that the total ad valorem property tax rate of the district bears to the total rate for the property in the year in which the additional taxes or penalties were added to the roll. [1991 c.459 §246; 1997 c.541 §291]