Year Percent 1995-01-01 0.14323100000000000 1996-01-01 0.14642200000000000 1997-01-01 0.17243900000000000 1998-01-01 0.26138500000000000 1999-01-01 0.23911600000000000 2000-01-01 0.14339400000000000 2001-01-01 0.18268800000000002 2002-01-01 0.15677600000000000 2003-01-01 0.17592900000000000 2004-01-01 0.16531800000000000 2005-01-01 0.13900700000000000 2006-01-01 0.18201900000000001 2007-01-01 0.19579200000000000 2008-01-01 0.17553500000000000 2009-01-01 0.21704800000000000 2010-01-01 0.18125400000000000 2011-01-01 0.25692700000000000 2012-01-01 0.14930300000000000 2013-01-01 0.12441300000000001 2014-01-01 0.12819300000000000 2015-01-01 0.18338400000000000 2016-01-01 0.24803000000000003