Year	Percent
2005-01-01	59.9
2006-01-01	60.1
2007-01-01	60.2
2008-01-01	60.3
2009-01-01	60.1
2010-01-01	59.9
2011-01-01	59.8
2012-01-01	59.9
2013-01-01	59.8
2014-01-01	59.7
2015-01-01	59.7
2016-01-01	60.0