There are authorized to be appropriated for the purpose of carrying out the activities of the Corporation, $90,000,000 for fiscal year 1975, $100,000,000 for fiscal year 1976, and such sums as may be necessary for fiscal year 1977. There are authorized to be appropriated for the purpose of carrying out the activities of the Corporation $205,000,000 for the fiscal year 1978, and such sums as may be necessary for each of the two succeeding fiscal years. The first appropriation may be made available to the Corporation at any time after six or more members of the Board have been appointed and qualified. Appropriations for that purpose shall be made for not more than two fiscal years, and shall be paid to the Corporation in annual installments at the beginning of each fiscal year in such amounts as may be specified in Acts of Congress making appropriations.