Year Percent 1996-01-01 46.6569 1997-01-01 53.8992 1998-01-01 50.2579 1999-01-01 36.4447 2000-01-01 56.8350 2001-01-01 61.7270 2002-01-01 62.9077 2003-01-01 70.2122 2004-01-01 84.1166 2005-01-01 95.4977 2006-01-01 100.0000 2007-01-01 99.1637 2008-01-01 100.0000 2009-01-01 100.0000 2010-01-01 95.2604 2011-01-01 53.5457 2012-01-01 45.8032 2013-01-01 46.9134 2014-01-01 48.5171 2015-01-01 51.5694 2016-01-01 51.9389