at a rate determined by the Secretary of the Treasury (as of the close of the calendar month preceding the month in which the advance is made) to be equal to the current average market yield on outstanding marketable obligations of the United States with remaining periods to maturity comparable to the anticipated period during which the advance will be outstanding, and (ii) compounded annually. (f) Availability of funds Amounts in the Marine Debris Response Trust Fund shall— (1) be available without fiscal year limitation and without apportionment