Year	Percent
1991-01-01	11.4770002365112
1992-01-01	11.4250001907349
1993-01-01	11.4160003662109
1994-01-01	11.4250001907349
1995-01-01	11.4390001296997
1996-01-01	11.4379997253418
1997-01-01	11.4680004119873
1998-01-01	11.3389997482300
1999-01-01	11.5240001678467
2000-01-01	11.3970003128052
2001-01-01	11.4259996414185
2002-01-01	11.3850002288818
2003-01-01	11.4099998474121
2004-01-01	11.4429998397827
2005-01-01	11.4659996032715
2006-01-01	11.4409999847412
2007-01-01	11.4540004730225
2008-01-01	11.4530000686646
2009-01-01	11.4549999237061
2010-01-01	11.4709997177124
2011-01-01	11.5179996490479
2012-01-01	11.3900003433228
2013-01-01	11.4510002136230
2014-01-01	11.4219999313354
2015-01-01	11.4739999771118
2016-01-01	11.5389995574951
2017-01-01	11.6040000915527