The proportionate share property within each government must bear of the debts of all local governments located wholly or in part within the geographic boundaries of the reporting government. Except for special assessment debt, the amount of debt of each unit applicable to the reporting unit is arrived at by (1) determining what percentage of the total assessed value of the overlapping jurisdiction lies within the limits of the reporting unit, and (2) applying this percentage to the total debt of the overlapping jurisdiction. Special assessment debt is allocated on the basis of the ratio of assessment receivable in each jurisdiction, which will be used wholly or in part to pay off the debt, to total assessments receivable, which will be used wholly or in part for this purpose.