Year	Percent
1986-01-01	12.11500000000000
1987-01-01	10.92750000000000
1988-01-01	9.75250000000000
1989-01-01	7.90250000000000
1990-01-01	7.75750000000000
1991-01-01	8.15500000000000
1992-01-01	6.66500000000000
1993-01-01	6.54250000000000
1994-01-01	7.81500000000000
1995-01-01	7.30250000000000
1996-01-01	6.32500000000000
1997-01-01	6.11500000000000
1998-01-01	6.39500000000000
1999-01-01	10.13750000000000
2000-01-01	9.66750000000000
2001-01-01	9.85250000000000
2002-01-01	9.80500000000000
2003-01-01	9.54000000000000
2004-01-01	10.00750000000000
2005-01-01	9.23500000000000
2006-01-01	7.80000000000000
2007-01-01	7.13000000000000
2008-01-01	7.79250000000000
2009-01-01	9.67500000000000
2010-01-01	8.15000000000000
2011-01-01	7.12500000000000
2012-01-01	6.43267569808634
2013-01-01	5.93237761509328
2014-01-01	6.39140353169338
2015-01-01	6.21371866366004
2016-01-01	6.49001247584928
2017-01-01	6.67368848036680