Year	Percent
1985-01-01	6.000000000000000
1986-01-01	6.000000000000000
1987-01-01	6.000000000000000
1988-01-01	6.000000000000000
1989-01-01	6.000000000000000
1990-01-01	6.000000000000000
1991-01-01	6.000000000000000
1992-01-01	6.000000000000000
1993-01-01	6.000000000000000
1994-01-01	6.666670000000000
1995-01-01	7.000000000000000
1996-01-01	7.000000000000000
1997-01-01	7.014170000000000
1998-01-01	7.243330000000000
1999-01-01	7.269170000000000
2000-01-01	7.599000000000000
2001-01-01	8.179170000000000
2002-01-01	8.317500000000000
2003-01-01	8.799310000000000
2004-01-01	9.231670000000000
2005-01-01	8.907010000000001
2006-01-01	5.421250000000000
2007-01-01	5.669710000000000
2008-01-01	7.337389999999999
2009-01-01	7.866550000000000
2010-01-01	8.409870000000000
2011-01-01	5.642810000000000
2012-01-01	6.076780000000000
2013-01-01	6.939240000000000
2014-01-01	8.403230000000000
2015-01-01	7.905900000000000
2016-01-01	6.768350000000000