Year Percent 1995-01-01 0.11901199999999999 1996-01-01 0.10751900000000000 1997-01-01 0.13063600000000000 1998-01-01 0.16822700000000000 1999-01-01 0.17741500000000002 2000-01-01 0.22803099999999998 2001-01-01 0.17625500000000000 2002-01-01 0.17560699999999999 2003-01-01 0.17528300000000000 2004-01-01 0.17067100000000002 2005-01-01 0.21736500000000000 2006-01-01 0.17947900000000000 2007-01-01 0.19673300000000000 2008-01-01 0.21285800000000000 2009-01-01 0.21615100000000000 2010-01-01 0.20031000000000000 2011-01-01 0.19343800000000000 2012-01-01 0.20727300000000000 2013-01-01 0.24601700000000000 2014-01-01 0.26691000000000000 2015-01-01 0.26352800000000004 2016-01-01 0.29341000000000000