Year Percent 1995-01-01 0.56983500000000010 1996-01-01 0.00570500000000000 1997-01-01 0.00541400000000000 1998-01-01 0.02891300000000000 1999-01-01 0.02133900000000000 2000-01-01 0.36886300000000000 2001-01-01 0.38387800000000000 2002-01-01 0.45155700000000000 2003-01-01 0.13685600000000000 2004-01-01 0.13296700000000000 2005-01-01 0.10857500000000000 2006-01-01 0.10319200000000000 2007-01-01 0.13637700000000000 2008-01-01 0.09410100000000000 2009-01-01 0.17188800000000000 2010-01-01 0.15235400000000000 2011-01-01 0.09329400000000000 2012-01-01 0.08564400000000001 2013-01-01 0.08746100000000000 2014-01-01 0.10321500000000002 2015-01-01 0.10548199999999999 2016-01-01 0.20060799999999998 2017-01-01 0.22270100000000000