Year Percent 1996-01-01 93.26020000000000 1997-01-01 100.00000000000000 1998-01-01 100.00000000000000 1999-01-01 93.88270000000000 2000-01-01 91.95560000000000 2001-01-01 89.83900000000000 2002-01-01 82.69200000000001 2003-01-01 82.31260000000000 2004-01-01 82.04970000000000 2005-01-01 80.82130000000000 2006-01-01 84.17930000000000 2007-01-01 93.07240000000000 2008-01-01 91.02010000000000 2009-01-01 81.18760000000000 2010-01-01 80.36170000000000 2011-01-01 76.73460000000000 2012-01-01 74.72290000000000 2013-01-01 77.47520000000000 2014-01-01 77.77640000000000 2015-01-01 63.54050000000000 2016-01-01 62.25240000000000