There are authorized to be appropriated to the Secretary for purposes of carrying out this chapter, not to exceed $3,000,000 for the fiscal year ending September 30, 1982, not less than one-half of which shall be for the purpose of making loans under section 3806(b) of this title; not to exceed $5,000,000 for the fiscal year ending September 30, 1983, not less than one-half of which shall be for the purpose of making loans under section 3806(b) of this title; not to exceed $5,000,000 for the fiscal year ending September 30, 1984, not less than one-half of which shall be for the purpose of making loans under section 3806(b) of this title; and such sums as may be necessary for the fiscal years ending September 30, 1985, and