Year	Percent
1986-01-01	10.89750000000000
1987-01-01	9.47500000000000
1988-01-01	8.14000000000000
1989-01-01	6.78500000000000
1990-01-01	6.94250000000000
1991-01-01	7.23500000000000
1992-01-01	5.64000000000000
1993-01-01	5.39500000000000
1994-01-01	6.67500000000000
1995-01-01	6.28000000000000
1996-01-01	5.59500000000000
1997-01-01	5.36500000000000
1998-01-01	5.80750000000000
1999-01-01	9.78500000000000
2000-01-01	9.32500000000000
2001-01-01	9.73000000000000
2002-01-01	9.63250000000000
2003-01-01	9.12750000000000
2004-01-01	9.35750000000000
2005-01-01	8.47250000000000
2006-01-01	6.85250000000000
2007-01-01	6.28750000000000
2008-01-01	6.78000000000000
2009-01-01	9.07500000000000
2010-01-01	7.20000000000000
2011-01-01	6.05000000000000
2012-01-01	5.41925559431482
2013-01-01	5.27888941026022
2014-01-01	6.04043631889257
2015-01-01	5.77982556726459
2016-01-01	6.12306387683212
2017-01-01	6.29755143695243