Year	Percent
1991-01-01	63.9570007324219
1992-01-01	62.7239990234375
1993-01-01	64.9270019531250
1994-01-01	64.6610031127930
1995-01-01	67.0350036621094
1996-01-01	66.5899963378906
1997-01-01	67.8430023193359
1998-01-01	69.4059982299805
1999-01-01	69.5400009155273
2000-01-01	69.6940002441406
2001-01-01	70.0749969482422
2002-01-01	68.5729980468750
2003-01-01	67.2730026245117
2004-01-01	67.7870025634766
2005-01-01	67.8359985351563
2006-01-01	69.8519973754883
2007-01-01	69.6999969482422
2008-01-01	69.5059967041016
2009-01-01	64.9319992065430
2010-01-01	64.9629974365234
2011-01-01	64.7429962158203
2012-01-01	65.1269989013672
2013-01-01	63.4970016479492
2014-01-01	65.2990036010742
2015-01-01	66.6389999389648
2016-01-01	66.0820007324219
2017-01-01	66.2600021362305