In computing the total amount of obligations of the Maine State Housing Authority which may at any time be outstanding for any purpose under this chapter:
1. Amounts to be refunded excluded. The amount of the outstanding obligations refunded or to be refunded from the proceeds of the sale of new obligations or by the exchange of new obligations shall be excluded; and
2. Amounts valued at current value. The amount of the outstanding obligations that have been issued as capital appreciation bonds or as similar instruments shall be valued as of any date of calculation at their then current accreted value rather than their face value.