For purposes of section 4577 of this title, there are authorized to be appropriated $85,000,000 for the fiscal year ending September 30, 1977, $91,000,000 for the fiscal year ending September 30, 1978, $102,500,000 for the fiscal year ending September 30, 1979, $102,500,000 for the fiscal year ending September 30, 1980, $115,000,000 for the fiscal year ending September 30, 1981, and $15,000,000 for the fiscal year ending September 30, 1982. Of the funds appropriated under this section for the fiscal year ending September 30, 1980, at least 8 percent of the funds shall be obligated for grants for proj­ects, programs, and services to prevent (through outreach, intervention, and education) the occurrence of alcoholism and alcohol abuse; of the funds appropriated under this section for the next fiscal year at least 10 percent of the funds shall be obligated for such grants; and of the funds appropriated under this section for the fiscal year ending September 30, 1982, at least 25 per centum of the funds shall be obligated for such grants.