Year Percent 1996-01-01 85.0785 1997-01-01 78.6616 1998-01-01 90.1466 1999-01-01 89.6852 2000-01-01 95.0262 2001-01-01 96.5389 2002-01-01 100.0000 2003-01-01 100.0000 2004-01-01 100.0000 2005-01-01 100.0000 2006-01-01 100.0000 2007-01-01 95.2289 2008-01-01 93.4959 2009-01-01 92.8897 2010-01-01 92.4817 2011-01-01 93.5052 2012-01-01 92.4584 2013-01-01 92.5528 2014-01-01 91.7574 2015-01-01 91.3412 2016-01-01 90.7876