2000 436 vehicles 1999 5,711 vehicles 1998 9,063 vehicles 1997 10,833 vehicles 1996 9,833 vehicles 1995 6,492 vehicles 1994 6,903 vehicles 1993 8,408 vehicles 1992 6,206 vehicles 1991 4,375 vehicles 1990 2,580 vehicles 1989 519 vehicles 1988 112 vehicles