Year Percent 1996-01-01 0.0000000000000000 1997-01-01 0.0050000000000000 1998-01-01 0.0060000000000000 1999-01-01 0.1200000000000000 2000-01-01 0.2930000000000000 2001-01-01 0.5790000000000000 2002-01-01 0.8670000000000000 2003-01-01 1.0500000000000000 2004-01-01 1.0780000000000000 2005-01-01 0.8895209999999999 2006-01-01 0.7989860000000000 2007-01-01 0.7608140000000000 2008-01-01 0.5480870000000000 2009-01-01 0.6265360000000000 2010-01-01 0.6382380000000000 2011-01-01 0.5754779999999999 2012-01-01 0.5668529999999999 2013-01-01 0.6508920000000000 2014-01-01 0.6939730000000000 2015-01-01 0.9127580000000000