2003 153 vehicles 2002 813 vehicles 2001 1,027 vehicles 2000 1,202 vehicles 1999 1,443 vehicles 1998 1,537 vehicles 1997 1,560 vehicles 1996 823 vehicles 1995 475 vehicles 1994 513 vehicles 1993 747 vehicles 1992 1,547 vehicles 1991 2,428 vehicles 1990 3,431 vehicles 1989 4,307 vehicles 1988 4,965 vehicles 1987 5,117 vehicles 1986 3,208 vehicles 1985 656 vehicles 1984 505 vehicles 1983 230 vehicles 1982 164 vehicles 1981 143 vehicles 1980 210 vehicles