1996 331 vehicles 1995 425 vehicles 1994 1,283 vehicles 1993 711 vehicles 1992 1,095 vehicles 1991 2,222 vehicles 1990 4,275 vehicles 1989 3,859 vehicles 1988 2,242 vehicles 1987 1,757 vehicles 1986 2,953 vehicles 1985 2,790 vehicles 1984 2,487 vehicles 1983 3,795 vehicles 1982 3,491 vehicles 1981 214 vehicles