Year Percent 1995-01-01 0.0000000000000000 1996-01-01 0.1486190000000000 1997-01-01 0.5080720000000001 1998-01-01 1.0672000000000000 1999-01-01 3.1208400000000003 2000-01-01 0.5277530000000000 2001-01-01 0.3943220000000000 2002-01-01 7.1604700000000000 2003-01-01 6.2684200000000000 2004-01-01 5.0199099999999990 2005-01-01 3.9627900000000000 2006-01-01 2.9290700000000003 2007-01-01 4.1322300000000000 2008-01-01 3.1121000000000000 2009-01-01 3.8177500000000000 2010-01-01 3.8250300000000004 2011-01-01 2.8338700000000000 2012-01-01 26.4790000000000000 2013-01-01 27.1099000000000000 2014-01-01 28.5363000000000000 2015-01-01 36.6905000000000000 2016-01-01 47.4004000000000000