Year Percent 1996-01-01 100.00000000000000 1997-01-01 100.00000000000000 1998-01-01 100.00000000000000 1999-01-01 100.00000000000000 2000-01-01 100.00000000000000 2001-01-01 100.00000000000000 2002-01-01 100.00000000000000 2003-01-01 100.00000000000000 2004-01-01 98.44900000000000 2005-01-01 100.00000000000000 2006-01-01 98.63010000000000 2007-01-01 95.10670000000000 2008-01-01 87.94990000000000 2009-01-01 89.70340000000000 2010-01-01 90.17200000000001 2011-01-01 91.07660000000000 2012-01-01 95.40799999999999 2013-01-01 95.75680000000000 2014-01-01 97.52330000000000 2015-01-01 94.90280000000000 2016-01-01 94.91180000000000