1997 122 vehicles 1996 180 vehicles 1995 231 vehicles 1994 444 vehicles 1993 781 vehicles 1992 1,041 vehicles 1989 112 vehicles 1988 114 vehicles 1987 117 vehicles 1986 186 vehicles 1985 3,243 vehicles 1984 3,099 vehicles 1983 1,168 vehicles 1982 3,109 vehicles 1981 746 vehicles