1997 1,799 vehicles 1996 2,078 vehicles 1995 1,765 vehicles 1994 1,431 vehicles 1993 1,312 vehicles 1992 1,470 vehicles 1991 1,628 vehicles 1990 2,479 vehicles 1989 2,147 vehicles 1988 2,280 vehicles 1987 2,086 vehicles 1986 2,011 vehicles 1985 1,394 vehicles 1984 1,783 vehicles 1983 1,823 vehicles 1982 1,110 vehicles