Year	Percent
2000-01-01	57.8194967625150
2001-01-01	58.4300149152056
2002-01-01	59.0747753455016
2003-01-01	58.4387970614778
2004-01-01	59.7826546699686
2005-01-01	60.3944376219592
2006-01-01	61.5478723696060
2007-01-01	62.0225458652020
2008-01-01	62.3018336849376
2009-01-01	61.5434792665348
2010-01-01	62.1734508849114
2011-01-01	62.7367583528030
2012-01-01	62.8447481025242
2013-01-01	63.3959211227524
2014-01-01	64.7526544584871
2015-01-01	65.3789663492160
2016-01-01	65.9444267475774
2017-01-01	66.6408539029241