Year	Percent
2000-01-01	64.4763206767689
2001-01-01	64.9087083848086
2002-01-01	65.6452678997081
2003-01-01	65.4733508159412
2004-01-01	66.3031762831374
2005-01-01	66.3453705428710
2006-01-01	66.3959612293379
2007-01-01	66.4131513993845
2008-01-01	66.1521147287637
2009-01-01	65.5116645711507
2010-01-01	65.8865017360075
2011-01-01	66.2193146005145
2012-01-01	66.5301434423896
2013-01-01	66.7766720038143
2014-01-01	68.0238812897800
2015-01-01	68.4367960700827
2016-01-01	68.6836321799195
2017-01-01	69.2356736083174