what are all the seasons?
1949-87, 1987/88, 1988/89, 1989/90, 1990/91, 1991/92, 1992/93, 1993/94, 1994/95, 1995/96, 1996/97, 1997/98, 1998/99, 1999/00
what tiers were reached during those seasons?
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 5
and during which season was tier 4 reached?
1998/99