Regulation 8 Calculation of the Charge

For the purposes of regulations 6 and 7 the rate of exchange of the United States dollar to a national currency shall be the average monthly rate of exchange of the United States dollar to that national currency established by the International Monetary Fund and publication in the International Financial Statistics of the International Monetary Fund for the month preceding the month during which the flight takes place shall be conclusive evidence of that matter; and a document purporting to be the International Financial Statistics published by the International Monetary Fund shall in any proceedings be received in evidence and, unless the contrary is proved, be deemed to be such a document.

In the event that the International Monetary Fund does not publish the International Financial Statistics for the month preceding the month during which the flight takes place, a certificate given by or on behalf of the Treasury stating the average monthly rate of exchange of the United States dollar to a national currency for the month preceding the month during which the flight takes place shall be conclusive evidence of that matter; and a document purporting to be such a certificate shall in any proceedings be received in evidence and, unless the contrary is proved, be deemed to be such a certificate.