Year	Percent
1996-01-01	65.9067
1997-01-01	58.0747
1998-01-01	52.7442
1999-01-01	46.9976
2000-01-01	59.3171
2001-01-01	64.1098
2002-01-01	61.1505
2003-01-01	66.9611
2004-01-01	59.8052
2005-01-01	54.4804
2006-01-01	57.4757
2007-01-01	60.9282
2008-01-01	53.7943
2009-01-01	60.8572
2010-01-01	55.3465
2011-01-01	51.9686
2012-01-01	49.1717
2013-01-01	45.1030
2014-01-01	45.9034
2015-01-01	41.0283
2016-01-01	38.2818