Year	Percent
1996-01-01	85.8847
1997-01-01	83.4244
1998-01-01	78.8036
1999-01-01	78.9238
2000-01-01	57.5566
2001-01-01	54.2787
2002-01-01	55.6928
2003-01-01	54.0056
2004-01-01	55.9898
2005-01-01	57.6422
2006-01-01	60.5518
2007-01-01	60.0141
2008-01-01	56.4504
2009-01-01	56.7072
2010-01-01	59.3019
2011-01-01	58.0945
2012-01-01	59.7147
2013-01-01	61.9491
2014-01-01	64.9414
2015-01-01	64.1834
2016-01-01	59.9145