Year Percent 1995-01-01 0.13877300000000000 1996-01-01 0.21018299999999998 1997-01-01 0.21377000000000000 1998-01-01 0.21630100000000002 1999-01-01 0.26426000000000000 2000-01-01 0.30771300000000000 2001-01-01 0.31595200000000000 2002-01-01 0.43324900000000000 2003-01-01 0.35307300000000000 2004-01-01 0.32141500000000000 2005-01-01 0.22421400000000000 2006-01-01 0.29561500000000000 2007-01-01 0.30097500000000000 2008-01-01 0.34683300000000000 2009-01-01 0.39545200000000000 2010-01-01 0.44515299999999997 2011-01-01 0.46698800000000000 2012-01-01 0.55964300000000000 2013-01-01 0.62231700000000000 2014-01-01 0.66897900000000000 2015-01-01 0.78210900000000000 2016-01-01 0.89158100000000000