Year	Percent
1991-01-01	4.60799980163574
1992-01-01	4.58300018310547
1993-01-01	4.57899999618530
1994-01-01	4.57999992370605
1995-01-01	4.61899995803833
1996-01-01	4.66900014877319
1997-01-01	4.77500009536743
1998-01-01	4.72700023651123
1999-01-01	4.69700002670288
2000-01-01	4.72800016403198
2001-01-01	4.65100002288818
2002-01-01	4.65799999237061
2003-01-01	4.57100009918213
2004-01-01	4.65600013732910
2005-01-01	4.66400003433228
2006-01-01	4.67600011825562
2007-01-01	4.69600009918213
2008-01-01	4.32100009918213
2009-01-01	3.94300007820129
2010-01-01	3.23300004005432
2011-01-01	3.24000000953674
2012-01-01	3.24499988555908
2013-01-01	3.24900007247925
2014-01-01	3.21600008010864
2015-01-01	3.21700000762939
2016-01-01	3.24699997901917
2017-01-01	3.26600003242493