Year	Percent
2005-01-01	53.0964796749631
2006-01-01	55.2336110709088
2007-01-01	56.5432110566390
2008-01-01	57.8584590116718
2009-01-01	58.4364636549817
2010-01-01	60.6131197241027
2011-01-01	62.1488754256248
2012-01-01	64.9681567165257
2013-01-01	65.8703864634996
2014-01-01	66.6218055348444
2015-01-01	66.5211079585762
2016-01-01	66.4204655760864
2017-01-01	67.9764263200397