Year	Percent
2005-01-01	61.7893034359578
2006-01-01	61.0901064266373
2007-01-01	61.0071186127047
2008-01-01	58.5198928467005
2009-01-01	60.3049037637457
2010-01-01	56.1614439655805
2011-01-01	55.7481476383130
2012-01-01	57.9269754291291
2013-01-01	58.9462499693518
2014-01-01	59.1759331280663
2015-01-01	59.1931095426093
2016-01-01	60.7991013856402
2017-01-01	62.2806411369038