Year Percent 1991 70.22 1992 70.22 1993 70.22 1994 70.22 1995 70.22 1996 70.22 1997 70.22 1998 70.22 1999 70.22 2000 70.22 2001 70.22 2002 70.22 2003 70.22 2004 70.22 2005 70.22 2006 70.22 2007 70.22 2008 70.22 2009 70.22 2010 70.22 2011 70.22 2012 70.22 2013 70.22 2014 70.22 2015 70.2