Year	Percent
1991-01-01	4.16699981689453
1992-01-01	4.28700017929077
1993-01-01	4.46899986267090
1994-01-01	4.34299993515015
1995-01-01	6.86999988555908
1996-01-01	6.64599990844727
1997-01-01	5.20399999618530
1998-01-01	10.48499965667720
1999-01-01	14.19299983978270
2000-01-01	11.09200000762940
2001-01-01	11.24499988555910
2002-01-01	14.86100006103520
2003-01-01	14.88399982452390
2004-01-01	12.11400032043460
2005-01-01	10.72999954223630
2006-01-01	10.41499996185300
2007-01-01	8.98999977111816
2008-01-01	8.52799987792969
2009-01-01	12.53400039672850
2010-01-01	12.17399978637700
2011-01-01	9.32800006866455
2012-01-01	9.25399971008301
2013-01-01	9.43700027465820
2014-01-01	9.18999958038330
2015-01-01	10.46800041198730
2016-01-01	9.88199996948242
2017-01-01	8.66100025177002