(a) For fiscal year 1987, fifty percent (50%) of such payment shall be paid to the situs county wherein such nuclear generating plant is located;
(b) For fiscal year 1988, forty-five percent (45%) of such payment shall be paid to the situs county wherein such nuclear generating plant is located;
(c) For fiscal year 1989, forty percent (40%) of such payment shall be paid to the situs county wherein such nuclear generating plant is located;
(d) For fiscal year 1990, thirty-five (35%) of such payment shall be paid to the situs county wherein such nuclear generating plant is located;
(e) For fiscal year 1991 and thereafter, thirty percent (30%) of such payment shall be paid to the situs county wherein such nuclear generating plant is located.