Year Percent 1996-01-01 64.4407 1997-01-01 65.5137 1998-01-01 73.7824 1999-01-01 74.2572 2000-01-01 86.3740 2001-01-01 95.8428 2002-01-01 100.0000 2003-01-01 100.0000 2004-01-01 99.9112 2005-01-01 91.5319 2006-01-01 89.6251 2007-01-01 88.2367 2008-01-01 89.4465 2009-01-01 90.8160 2010-01-01 91.2552 2011-01-01 92.8764 2012-01-01 92.6244 2013-01-01 93.5987 2014-01-01 92.9174 2015-01-01 93.7533 2016-01-01 87.3807