Year	Percent
1991-01-01	7.16400003433228
1992-01-01	7.15899991989136
1993-01-01	7.15299987792969
1994-01-01	7.16800022125244
1995-01-01	7.24800014495850
1996-01-01	7.20100021362305
1997-01-01	7.16300010681152
1998-01-01	7.17899990081787
1999-01-01	7.17999982833862
2000-01-01	7.16200017929077
2001-01-01	7.19899988174438
2002-01-01	7.24900007247925
2003-01-01	7.27500009536743
2004-01-01	7.28599977493286
2005-01-01	7.28000020980835
2006-01-01	7.27199983596802
2007-01-01	7.28000020980835
2008-01-01	7.28000020980835
2009-01-01	7.24700021743774
2010-01-01	7.28800010681152
2011-01-01	7.28499984741211
2012-01-01	7.28599977493286
2013-01-01	7.30200004577637
2014-01-01	7.30700016021729
2015-01-01	7.28499984741211
2016-01-01	7.28999996185303
2017-01-01	7.31199979782104