Year	Percent
1991-01-01	11.49893847024280
1992-01-01	11.37197804027020
1993-01-01	11.65608381433990
1994-01-01	11.59933549379420
1995-01-01	11.45144433151550
1996-01-01	11.93645352974750
1997-01-01	11.91393355181730
1998-01-01	12.15378766279570
1999-01-01	12.54312600858970
2000-01-01	12.28860462112760
2001-01-01	12.20027682889990
2002-01-01	11.68700334238800
2003-01-01	11.52362030914170
2004-01-01	11.50128539515400
2005-01-01	11.12021703806590
2006-01-01	11.10131627666950
2007-01-01	11.01811472329150
2008-01-01	10.95810224464850
2009-01-01	10.75704970388240
2010-01-01	10.94953167854140
2011-01-01	10.70804590228760
2012-01-01	10.26559516085230
2013-01-01	10.02553825921530
2014-01-01	9.97462083254192
2015-01-01	10.22385215361550
2016-01-01	10.25468374243760
2017-01-01	10.27830451916320