Year	Percent
1991-01-01	9.66199970245361
1992-01-01	9.70800018310547
1993-01-01	9.71800041198730
1994-01-01	9.69400024414063
1995-01-01	9.71399974822998
1996-01-01	9.71899986267090
1997-01-01	9.73600006103516
1998-01-01	9.73900032043457
1999-01-01	9.74800014495850
2000-01-01	9.74600028991699
2001-01-01	9.00100040435791
2002-01-01	8.32100009918213
2003-01-01	7.63399982452393
2004-01-01	5.81300020217896
2005-01-01	3.89899992942810
2006-01-01	4.41400003433228
2007-01-01	4.93300008773804
2008-01-01	5.45200014114380
2009-01-01	5.89599990844727
2010-01-01	6.41800022125244
2011-01-01	3.75900006294250
2012-01-01	1.00499999523163
2013-01-01	1.49699997901917
2014-01-01	1.98899996280670
2015-01-01	3.02300000190735
2016-01-01	3.02099990844727
2017-01-01	3.01900005340576