The amount of funds that may be expended as medical assistance to carry out the purposes of this section shall be for fiscal year 1991, $5,000,000, for fiscal year 1992, $10,000,000, for fiscal year 1993, $20,000,000, for fiscal year 1994, $30,000,000, for fiscal year 1995, $35,000,000, and for fiscal years thereafter such sums as provided by Congress.