1998 2,871 vehicles 1997 9,896 vehicles 1996 8,127 vehicles 1995 5,182 vehicles 1994 2,995 vehicles 1993 1,952 vehicles 1992 1,893 vehicles 1991 1,598 vehicles 1990 1,960 vehicles 1989 1,504 vehicles 1988 1,108 vehicles 1987 1,558 vehicles 1986 1,794 vehicles 1985 1,733 vehicles 1984 519 vehicles 1983 202 vehicles 1982 106 vehicles