Year Percent 1998-01-01 92.8678 1999-01-01 92.0728 2000-01-01 92.0728 2001-01-01 92.0728 2002-01-01 92.0728 2003-01-01 100.0000 2004-01-01 100.0000 2005-01-01 92.9616 2006-01-01 100.0000 2007-01-01 100.0000 2008-01-01 91.4086 2009-01-01 91.1943 2010-01-01 94.3918 2011-01-01 94.0204 2012-01-01 91.5954 2013-01-01 90.7866 2014-01-01 90.0902 2015-01-01 80.2801 2016-01-01 79.8939