To make payments under grants under sections 300t–12 and 300t–13 of this title there are authorized to be appropriated $30,000,000 for the fiscal year ending September 30, 1980, $50,000,000 for the fiscal year ending September 30, 1981, and $75,000,000 for the fiscal year ending September 30, 1982, except that in any fiscal year not more than 10 percent of the amount appropriated under this section may be obligated for grants under section 300t–13 of this title.