Year	Percent
1991-01-01	1.56400001049042
1992-01-01	1.61199998855591
1993-01-01	1.58800005912781
1994-01-01	1.59700000286102
1995-01-01	1.60399997234344
1996-01-01	1.60099995136261
1997-01-01	1.59599995613098
1998-01-01	1.59599995613098
1999-01-01	1.63100004196167
2000-01-01	1.63999998569489
2001-01-01	1.63300001621246
2002-01-01	1.63499999046326
2003-01-01	1.63800001144409
2004-01-01	1.63699996471405
2005-01-01	1.63600003719330
2006-01-01	1.63399994373322
2007-01-01	1.62999999523163
2008-01-01	1.57500004768372
2009-01-01	1.58500003814697
2010-01-01	1.58599996566772
2011-01-01	1.58700001239777
2012-01-01	1.59700000286102
2013-01-01	1.60300004482269
2014-01-01	1.59899997711182
2015-01-01	1.59200000762939
2016-01-01	1.62999999523163
2017-01-01	1.65900003910065