; and (2) the amount of interest accrued in the Fund within each account for the fiscal year in which the expenditures are made, with the interest accrued within each account used only for expenditures from that account. (b) Additional expenditures (1) In general The Secretary may expend more than $115,000,000 for any fiscal year referred to in subsection (a) if the additional amounts are available in the Fund as a result of a failure of the Secretary to expend all of the amounts available under subsection (a) in 1 or more prior fiscal years. (2) Retention in accounts Any additional amounts referred to in paragraph (1) shall— (A) be retained within the account to which the amounts were designated; (B) accrue interest for the designated account in accordance with this title; and (C) only be expended for the purposes for which expenditures from the designated accounts are authorized. 105. Investments of amounts (a) In general The Secretary shall invest such portion of the Fund as is not, in the judgment of the Secretary, required to meet current withdrawals. (b) Credits to Fund The interest on, and the proceeds from the sale or redemption of, any obligations held in the Fund shall be credited to, and form a part of, the Fund. 106. Transfers of amounts (a) In general The amounts required to be transferred to the Fund under this title shall be transferred at least monthly from the general fund of the Treasury to the Fund on the basis of estimates made by the Secretary of the Treasury. (b) Adjustments Proper adjustment shall be made in amounts subsequently transferred to the extent prior estimates are in excess of, or less than, the amounts required to be transferred. 107. Termination On September 30, 2038— (1) the Fund shall terminate