Year	Percent
2005-01-01	45.9
2006-01-01	44.9
2007-01-01	44.3
2008-01-01	43.7
2009-01-01	43.1
2010-01-01	42.6
2011-01-01	42.1
2012-01-01	41.2
2013-01-01	40.3
2014-01-01	39.5
2015-01-01	38.9
2016-01-01	37.9