Year	Percent
2005-01-01	54.4446817277321
2006-01-01	55.5008970690441
2007-01-01	56.3302949936208
2008-01-01	57.2645051720800
2009-01-01	56.0645261416183
2010-01-01	59.3208598612513
2011-01-01	61.3007166112907
2012-01-01	61.8382349485344
2013-01-01	62.3257403218222
2014-01-01	62.2151298470624
2015-01-01	62.4411268409406
2016-01-01	62.2390053776648
2017-01-01	62.6790257821913