Year	Percent
1991-01-01	10.68700027465820
1992-01-01	10.47299957275390
1993-01-01	10.70100021362300
1994-01-01	10.46100044250490
1995-01-01	10.72399997711180
1996-01-01	10.69400024414060
1997-01-01	10.62399959564210
1998-01-01	10.51399993896480
1999-01-01	10.54100036621090
2000-01-01	10.46800041198730
2001-01-01	10.40100002288820
2002-01-01	10.44999980926510
2003-01-01	10.50899982452390
2004-01-01	10.48700046539310
2005-01-01	10.42800045013430
2006-01-01	10.11400032043460
2007-01-01	9.87100028991699
2008-01-01	9.49600028991699
2009-01-01	9.17700004577637
2010-01-01	8.82100009918213
2011-01-01	8.46100044250488
2012-01-01	8.08899974822998
2013-01-01	7.82499980926514
2014-01-01	7.83599996566772
2015-01-01	7.78800010681152
2016-01-01	7.77799987792969
2017-01-01	7.81799983978271