1996 2,454 vehicles 1995 6,862 vehicles 1994 7,473 vehicles 1993 12,933 vehicles 1992 16,030 vehicles 1991 16,826 vehicles 1990 14,408 vehicles 1989 11,701 vehicles 1988 7,581 vehicles 1987 3,759 vehicles 1986 1,774 vehicles 1985 635 vehicles 1984 383 vehicles