Year Percent 1998-01-01 0.34530300000000000 1999-01-01 0.61885200000000010 2000-01-01 0.65285900000000000 2001-01-01 0.60805300000000000 2002-01-01 0.57346000000000010 2003-01-01 0.60084600000000000 2004-01-01 0.49049000000000000 2005-01-01 0.47672200000000003 2006-01-01 0.65624300000000000 2007-01-01 0.58061700000000000 2008-01-01 0.69346100000000000 2009-01-01 0.77145299999999990 2010-01-01 0.34711700000000000 2011-01-01 0.15470100000000000 2012-01-01 0.10258199999999999 2013-01-01 0.06800000000000000 2014-01-01 0.00845800000000000 2015-01-01 0.02482000000000000 2016-01-01 0.11490299999999999