Year Number of 1984 9.758 1989 6.704 1992 4.335 1994 3.33 1996 7.64 1998 8.679 2000 5.744 2002 4.162 2004 1.75 2005 5.459 2006 0.7624 2008 1.322 2010 0.8488 2012 1.245