1998 109 vehicles 1997 296 vehicles 1996 569 vehicles 1995 689 vehicles 1994 744 vehicles 1993 579 vehicles 1992 535 vehicles 1991 809 vehicles 1990 851 vehicles 1989 774 vehicles 1988 460 vehicles 1987 306 vehicles 1986 216 vehicles 1985 183 vehicles 1984 202 vehicles 1983 217 vehicles 1982 268 vehicles 1981 529 vehicles 1980 550 vehicles