There are authorized to be appropriated such funds as Congress may determine necessary to support research on specific national or regional animal health or disease problems, or national or regional problems relating to pre-harvest, on-farm food safety, or animal well-being, but not to exceed $35,000,000 for each of the fiscal years 1991 through 2012, and not in excess of such sums as may after September 29, 1977, be authorized by law for any subsequent fiscal year.