Year	Percent
1991-01-01	10.10200023651120
1992-01-01	8.62600040435791
1993-01-01	7.17700004577637
1994-01-01	7.43100023269653
1995-01-01	9.03299999237061
1996-01-01	9.42300033569336
1997-01-01	9.98200035095215
1998-01-01	10.44299983978270
1999-01-01	10.94099998474120
2000-01-01	13.39799976348880
2001-01-01	14.12600040435790
2002-01-01	13.60599994659420
2003-01-01	13.82999992370610
2004-01-01	11.87699985504150
2005-01-01	11.74699974060060
2006-01-01	8.75500011444092
2007-01-01	7.58099985122681
2008-01-01	7.86399984359741
2009-01-01	8.86600017547607
2010-01-01	1.30400002002716
2011-01-01	1.76300001144409
2012-01-01	3.85999989509583
2013-01-01	6.11399984359741
2014-01-01	4.16900014877319
2015-01-01	6.81899976730347
2016-01-01	7.30399990081787
2017-01-01	7.68300008773804