Year	Percent
1991-01-01	9.96100044250488
1992-01-01	10.53600025177000
1993-01-01	9.27499961853027
1994-01-01	8.40600013732910
1995-01-01	8.75199985504150
1996-01-01	9.82299995422363
1997-01-01	8.99800014495850
1998-01-01	10.49600028991700
1999-01-01	10.08699989318850
2000-01-01	9.84500026702881
2001-01-01	10.36800003051760
2002-01-01	9.17000007629395
2003-01-01	9.01700019836426
2004-01-01	9.20899963378906
2005-01-01	9.26799964904785
2006-01-01	8.21300029754639
2007-01-01	8.65100002288818
2008-01-01	8.35499954223633
2009-01-01	7.60099983215332
2010-01-01	7.36700010299683
2011-01-01	7.61999988555908
2012-01-01	7.28900003433228
2013-01-01	6.68699979782104
2014-01-01	7.61299991607666
2015-01-01	6.77699995040894
2016-01-01	8.69799995422363
2017-01-01	8.59300041198730