1994 794 vehicles 1993 1,670 vehicles 1992 1,813 vehicles 1991 4,148 vehicles 1990 5,812 vehicles 1989 7,161 vehicles 1988 8,460 vehicles 1987 10,693 vehicles 1986 9,401 vehicles 1985 4,655 vehicles 1982 463 vehicles 1981 205 vehicles