1997 163 vehicles 1996 186 vehicles 1995 10,414 vehicles 1994 12,690 vehicles 1993 12,535 vehicles 1992 8,801 vehicles 1991 4,609 vehicles 1990 6,336 vehicles 1989 6,036 vehicles 1988 5,278 vehicles 1987 3,479 vehicles 1986 1,585 vehicles 1985 765 vehicles 1984 409 vehicles 1983 179 vehicles