Year Percent 1996-01-01 0.6847850000000001 1997-01-01 0.7737430000000001 1998-01-01 0.8639140000000000 1999-01-01 0.9387450000000000 2000-01-01 0.8059830000000000 2001-01-01 0.5691010000000000 2002-01-01 0.4083750000000000 2003-01-01 0.4145760000000000 2004-01-01 0.5015240000000000 2005-01-01 0.5239149999999999 2006-01-01 0.5647670000000000 2007-01-01 0.8538300000000000 2008-01-01 0.8556080000000000 2009-01-01 0.8326830000000000 2010-01-01 1.0360600000000000 2011-01-01 0.8233600000000001 2012-01-01 1.1402500000000000 2013-01-01 1.2456399999999999 2014-01-01 1.4858600000000000 2015-01-01 1.7724900000000001 2016-01-01 1.7040000000000000