Year	Percent
2005-01-01	38.0341056736888
2006-01-01	39.1452908166646
2007-01-01	40.4354433334434
2008-01-01	42.0664823007317
2009-01-01	42.1768170384261
2010-01-01	46.6538625329275
2011-01-01	49.1210983546566
2012-01-01	50.2051274406806
2013-01-01	50.9704526550954
2014-01-01	51.6926001111302
2015-01-01	51.8941121482860
2016-01-01	52.0329564729897
2017-01-01	52.7900412015088