1998 109 vehicles 1997 304 vehicles 1996 617 vehicles 1995 1,023 vehicles 1994 1,074 vehicles 1993 2,365 vehicles 1992 2,975 vehicles 1991 996 vehicles 1990 2,524 vehicles 1989 3,568 vehicles 1988 3,689 vehicles 1987 2,967 vehicles 1986 811 vehicles