2006 163 vehicles 2001 109 vehicles 1998 265 vehicles 1997 626 vehicles 1996 1,044 vehicles 1995 875 vehicles 1994 1,925 vehicles 1993 2,945 vehicles 1992 2,247 vehicles 1991 5,685 vehicles 1990 8,379 vehicles 1989 8,898 vehicles 1988 7,303 vehicles 1987 11,939 vehicles 1986 11,387 vehicles 1985 9,628 vehicles 1984 11,246 vehicles 1983 2,983 vehicles 1982 2,460 vehicles 1981 2,661 vehicles 1980 3,325 vehicles