Year	Percent
2005-01-01	61.5
2006-01-01	62.1
2007-01-01	62.6
2008-01-01	62.7
2009-01-01	61.7
2010-01-01	61.4
2011-01-01	61.5
2012-01-01	61.8
2013-01-01	62.3
2014-01-01	62.9
2015-01-01	63.5
2016-01-01	64.2