Year	Percent
2004-01-01	37.4229
2005-01-01	39.8900
2006-01-01	44.4809
2007-01-01	44.1451
2008-01-01	48.7398
2009-01-01	57.3163
2010-01-01	56.4493
2011-01-01	58.4895
2012-01-01	64.1055
2013-01-01	64.7833
2014-01-01	67.0831
2015-01-01	72.3439
2016-01-01	75.9581