1994 175 vehicles 1993 161 vehicles 1992 991 vehicles 1991 7,470 vehicles 1990 11,646 vehicles 1989 16,187 vehicles 1988 14,989 vehicles 1987 15,344 vehicles 1986 11,801 vehicles 1985 11,979 vehicles 1984 10,994 vehicles 1983 1,657 vehicles