Year	Percent
1991-01-01	11.1129999160767
1992-01-01	11.0790004730225
1993-01-01	11.1149997711182
1994-01-01	11.0690002441406
1995-01-01	11.1099996566772
1996-01-01	11.1090002059937
1997-01-01	11.0749998092651
1998-01-01	11.0950002670288
1999-01-01	11.0959997177124
2000-01-01	11.0930004119873
2001-01-01	11.0889997482300
2002-01-01	11.0900001525879
2003-01-01	11.0900001525879
2004-01-01	11.0869998931885
2005-01-01	11.0869998931885
2006-01-01	11.0850000381470
2007-01-01	11.0869998931885
2008-01-01	11.0880002975464
2009-01-01	11.0889997482300
2010-01-01	11.0909996032715
2011-01-01	11.0909996032715
2012-01-01	11.0989999771118
2013-01-01	11.1099996566772
2014-01-01	11.1160001754761
2015-01-01	11.1180000305176
2016-01-01	11.0360002517700
2017-01-01	10.9680004119873