The requirements of this Article XV shall apply only as long as federal funds under Title XIX of the Social Security Act are available to match the intergovernmental transfer payments made and disbursed under this Article and only as long as reimbursable expenditures are matched by the federal government at a rate of at least 50%. Whenever the Illinois Department is informed that federal funds are not available for these purposes, or shall be available at a lower percentage, this Article XV shall no longer apply and the Illinois Department shall promptly refund to each county provider the amount of money currently in the Fund that has been paid by the county provider, plus any investment earnings on that amount.