The general fund amount of lease payments for a biennium associated with capital construction projects financed by the industrial commission acting as the state building authority may not exceed the amount equal to a portion of sales, use, and motor vehicle excise tax collections equal to ten percent of an amount, determined by multiplying the quotient of one percent divided by the general sales tax rate that was in effect when the taxes were collected, times the net sales, use, and motor vehicle excise tax collections under chapters 57-39.2, 57-40.2, and 57-40.3. The computation for the authorized general fund lease payments for a biennium must be based on the projected sales, use, and motor vehicle excise tax collections presented to the legislative assembly at the close of the most recently adjourned regular legislative session. Lease payment amounts for any particular project must be calculated as of the date the related bonds are issued.