1999 3,143 vehicles 1998 9,460 vehicles 1997 9,557 vehicles 1996 4,594 vehicles 1995 1,030 vehicles 1994 1,209 vehicles 1993 758 vehicles 1992 459 vehicles 1991 302 vehicles 1990 279 vehicles 1989 155 vehicles 1988 149 vehicles 1987 216 vehicles 1986 203 vehicles 1985 194 vehicles