Beginning in fiscal year 1993, and in each year thereafter, notwithstanding any other provision of law, all amounts appropriated for disaster assistance payments under the Robert T. Stafford Disaster Relief and Emergency Assistance Act (42 U.S.C. 5121 et seq.) that are in excess of either the historical annual average obligation of $320,000,000, or the amount submitted in the President’s initial budget request, whichever is lower, shall be considered as “emergency requirements” pursuant to section 901(b)(2)(D) 1