2006 4,488 vehicles 2005 22,742 vehicles 2004 25,268 vehicles 2003 28,138 vehicles 2002 31,213 vehicles 2001 29,816 vehicles 2000 18,258 vehicles 1999 17,408 vehicles 1998 19,413 vehicles 1997 16,541 vehicles 1996 15,152 vehicles 1995 2,573 vehicles