Year	Percent
2005-01-01	40.1
2006-01-01	39.9
2007-01-01	39.8
2008-01-01	39.7
2009-01-01	39.9
2010-01-01	40.1
2011-01-01	40.2
2012-01-01	40.1
2013-01-01	40.2
2014-01-01	40.3
2015-01-01	40.3
2016-01-01	40.0