1994 115 vehicles 1993 225 vehicles 1992 647 vehicles 1991 765 vehicles 1990 1,146 vehicles 1989 1,677 vehicles 1988 1,475 vehicles 1987 850 vehicles 1986 1,582 vehicles 1985 1,717 vehicles 1984 1,571 vehicles 1983 1,873 vehicles 1982 2,094 vehicles 1981 177 vehicles