2003 6,103 vehicles 2002 6,895 vehicles 2001 4,626 vehicles 2000 5,501 vehicles 1999 8,404 vehicles 1998 10,952 vehicles 1997 11,582 vehicles 1996 7,265 vehicles 1995 4,459 vehicles 1994 3,814 vehicles 1993 3,493 vehicles 1992 3,356 vehicles 1991 3,744 vehicles 1990 3,434 vehicles 1989 2,211 vehicles 1988 1,501 vehicles 1987 1,260 vehicles 1986 739 vehicles 1985 653 vehicles 1984 658 vehicles 1983 532 vehicles 1982 411 vehicles 1981 257 vehicles