1999 141 vehicles 1998 175 vehicles 1997 163 vehicles 1996 154 vehicles 1995 236 vehicles 1994 246 vehicles 1993 259 vehicles 1992 113 vehicles 1989 145 vehicles 1988 103 vehicles 1986 117 vehicles 1985 105 vehicles 1984 137 vehicles 1983 257 vehicles 1982 847 vehicles 1981 359 vehicles