Year	Percent
2004-01-01	51.6883
2005-01-01	46.4670
2006-01-01	49.8882
2007-01-01	49.7455
2008-01-01	51.7393
2009-01-01	60.5774
2010-01-01	55.7416
2011-01-01	53.7570
2012-01-01	51.9667
2013-01-01	49.9211
2014-01-01	53.6315
2015-01-01	54.9114
2016-01-01	48.9632