2006 1,019 vehicles 2005 1,176 vehicles 2004 1,863 vehicles 2003 2,408 vehicles 2002 2,746 vehicles 2001 2,984 vehicles 2000 3,613 vehicles 1999 670 vehicles 1998 829 vehicles 1997 857 vehicles 1996 1,075 vehicles 1995 1,548 vehicles 1994 2,606 vehicles 1993 3,647 vehicles 1992 5,460 vehicles 1991 6,044 vehicles 1990 6,303 vehicles 1989 3,116 vehicles 1988 3,102 vehicles 1987 2,755 vehicles 1986 2,336 vehicles 1985 2,093 vehicles