Year Percent 1994-01-01 1.15496000000000000 1995-01-01 0.04194400000000000 1996-01-01 0.02591100000000000 1997-01-01 0.05599800000000000 1998-01-01 0.11115200000000000 1999-01-01 0.21704800000000000 2000-01-01 0.19250400000000000 2001-01-01 0.32172300000000000 2002-01-01 0.27121200000000000 2003-01-01 0.25879100000000000 2004-01-01 0.37338200000000000 2005-01-01 0.44980100000000000 2006-01-01 0.38592400000000000 2007-01-01 0.35903000000000000 2008-01-01 0.34542500000000000 2009-01-01 0.41754300000000005 2010-01-01 0.34428300000000000 2011-01-01 0.29747900000000000 2012-01-01 0.26185800000000000 2013-01-01 0.29388000000000003 2014-01-01 0.37683200000000000 2015-01-01 0.50448600000000000 2016-01-01 0.52062900000000000 2017-01-01 0.50960900000000000