Year	Percent
2000-01-01	51.2082690061694
2001-01-01	51.6801093731777
2002-01-01	51.9362068089800
2003-01-01	53.9837704698904
2004-01-01	52.8782622250699
2005-01-01	53.4692582811585
2006-01-01	52.9363377363384
2007-01-01	52.4876191851142
2008-01-01	52.2113805396024
2009-01-01	52.5786251954027
2010-01-01	51.8878739024358
2011-01-01	51.0182166901201
2012-01-01	49.7113610958731
2013-01-01	48.5338532998023
2014-01-01	46.8569819515392
2015-01-01	45.6954424083785
2016-01-01	45.2624247904061
2017-01-01	44.1395643398510