Year	Percent
2000-01-01	56.0705834914850
2001-01-01	56.8358546424355
2002-01-01	57.7623007902530
2003-01-01	56.9003697727504
2004-01-01	58.1802618584878
2005-01-01	58.6503096525962
2006-01-01	60.0203981013354
2007-01-01	60.5203140922036
2008-01-01	60.8240590297290
2009-01-01	59.8527221221144
2010-01-01	60.3532473818866
2011-01-01	60.9520213640359
2012-01-01	61.2059530981523
2013-01-01	61.7872491854213
2014-01-01	62.6602244916858
2015-01-01	63.3048759452252
2016-01-01	63.8518277637701
2017-01-01	64.4644218911281