1994 203 vehicles 1993 288 vehicles 1992 6,820 vehicles 1991 11,902 vehicles 1990 18,735 vehicles 1989 14,171 vehicles 1988 5,755 vehicles 1987 5,741 vehicles 1986 6,510 vehicles 1985 6,144 vehicles 1985 1,852 vehicles 1984 6,788 vehicles 1984 1,654 vehicles 1983 6,696 vehicles 1983 1,006 vehicles 1982 6,929 vehicles 1982 2,690 vehicles 1981 6,579 vehicles 1981 529 vehicles 1980 9,700 vehicles 1980 2,554 vehicles