1993 132 vehicles 1992 121 vehicles 1991 113 vehicles 1990 321 vehicles 1989 665 vehicles 1988 996 vehicles 1987 941 vehicles 1986 1,608 vehicles 1985 1,995 vehicles 1984 1,887 vehicles 1983 1,493 vehicles 1982 684 vehicles 1981 389 vehicles 1980 430 vehicles