2003 400 vehicles 2002 2,041 vehicles 2001 4,156 vehicles 2000 5,290 vehicles 1999 3,332 vehicles 1998 1,838 vehicles 1997 795 vehicles 1996 656 vehicles 1995 279 vehicles 1994 352 vehicles 1993 298 vehicles 1992 355 vehicles 1991 305 vehicles 1990 154 vehicles 1989 303 vehicles 1988 122 vehicles