1998 144 vehicles 1997 777 vehicles 1996 1,023 vehicles 1995 2,412 vehicles 1994 23,242 vehicles 1993 18,562 vehicles 1992 10,006 vehicles 1991 7,933 vehicles 1990 5,740 vehicles 1989 1,366 vehicles 1988 220 vehicles 1983 150 vehicles 1982 104 vehicles