1994 106 vehicles 1993 440 vehicles 1992 560 vehicles 1991 584 vehicles 1990 830 vehicles 1989 1,084 vehicles 1988 1,223 vehicles 1987 1,640 vehicles 1986 2,141 vehicles 1985 2,908 vehicles 1984 3,891 vehicles 1983 4,849 vehicles 1982 3,887 vehicles 1981 3,982 vehicles 1980 5,529 vehicles