Year	Percent
1991-01-01	5.01000022888184
1992-01-01	5.01200008392334
1993-01-01	5.04899978637695
1994-01-01	5.06400012969971
1995-01-01	5.01100015640259
1996-01-01	5.00299978256226
1997-01-01	5.00699996948242
1998-01-01	5.04400014877319
1999-01-01	5.01300001144409
2000-01-01	5.06599998474121
2001-01-01	5.12300014495850
2002-01-01	5.13000011444092
2003-01-01	5.09299993515015
2004-01-01	5.09800004959106
2005-01-01	5.55399990081787
2006-01-01	6.01499986648560
2007-01-01	6.49800014495850
2008-01-01	6.94199991226196
2009-01-01	7.38399982452393
2010-01-01	7.85200023651123
2011-01-01	8.31000041961670
2012-01-01	8.82299995422363
2013-01-01	9.28299999237061
2014-01-01	9.50899982452393
2015-01-01	9.39299964904785
2016-01-01	9.34099960327148
2017-01-01	9.04100036621094