Year Percent 1991-01-01 0.019280000000000002 1992-01-01 0.031375000000000000 1993-01-01 0.212778000000000020 1994-01-01 0.679609000000000000 1995-01-01 0.645902000000000100 1996-01-01 0.563281000000000000 1997-01-01 0.550914000000000000 1998-01-01 0.544575000000000000 1999-01-01 0.555521000000000000 2000-01-01 0.486764999999999950 2001-01-01 0.632630000000000000 2002-01-01 0.665980000000000000 2003-01-01 0.714929000000000000 2004-01-01 0.666200000000000000 2005-01-01 0.648322000000000100 2006-01-01 0.671373000000000000 2007-01-01 0.577580000000000000 2008-01-01 0.587222000000000000 2009-01-01 0.731878000000000000 2010-01-01 0.877070999999999900 2011-01-01 0.958940000000000000 2012-01-01 0.971221999999999900 2013-01-01 1.129420000000000000 2014-01-01 1.174860000000000000 2015-01-01 1.132229999999999800 2016-01-01 0.985846999999999900