2001 881 vehicles 2000 2,894 vehicles 1999 2,059 vehicles 1998 2,527 vehicles 1997 2,163 vehicles 1996 2,722 vehicles 1995 3,015 vehicles 1994 3,605 vehicles 1993 4,013 vehicles 1992 4,065 vehicles 1991 4,617 vehicles 1990 4,746 vehicles 1989 1,392 vehicles 1988 489 vehicles 1987 427 vehicles 1986 361 vehicles 1985 337 vehicles 1984 309 vehicles 1983 282 vehicles 1982 267 vehicles 1981 264 vehicles 1980 436 vehicles