Year Percent 1996-01-01 0.058786000000000000 1997-01-01 0.044573000000000000 1998-01-01 0.046728000000000000 1999-01-01 0.030930000000000003 2000-01-01 0.046010000000000000 2001-01-01 0.040582000000000000 2002-01-01 0.033786000000000004 2003-01-01 0.039628000000000000 2004-01-01 0.035630000000000000 2005-01-01 0.032333999999999995 2006-01-01 0.031948000000000004 2007-01-01 0.053138000000000000 2008-01-01 0.064471000000000000 2009-01-01 0.067928000000000000 2010-01-01 0.067744000000000000 2011-01-01 0.088489000000000000 2012-01-01 0.078224000000000000 2013-01-01 0.092445000000000000 2014-01-01 0.086184000000000000 2015-01-01 0.119082000000000000 2016-01-01 0.146534000000000000