Year	Percent
1980-01-01	0.27117199999999997
1981-01-01	0.23462199999999997
1982-01-01	0.23462199999999997
1983-01-01	0.23462199999999997
1984-01-01	0.23462199999999997
1985-01-01	0.23462199999999997
1986-01-01	0.23462199999999997
1987-01-01	0.23462199999999997
1988-01-01	0.23462199999999997
1989-01-01	0.23462199999999997
1990-01-01	0.23462199999999997
1991-01-01	0.23462199999999997
1992-01-01	0.23462199999999997
1993-01-01	0.23462199999999997
1994-01-01	0.32065100000000000
1995-01-01	0.25161300000000003
1996-01-01	0.27754500000000000
1997-01-01	0.26622800000000000
1998-01-01	0.26622800000000000
1999-01-01	0.26622800000000000
2000-01-01	0.26622800000000000
2001-01-01	0.26622800000000000
2002-01-01	0.26622800000000000
2003-01-01	0.26622800000000000
2004-01-01	0.26622800000000000
2005-01-01	0.26622800000000000
2006-01-01	0.26622800000000000
2007-01-01	0.26622800000000000
2008-01-01	0.26622800000000000
2009-01-01	0.26622800000000000
2010-01-01	0.26622800000000000
2011-01-01	0.61681400000000010
2012-01-01	2.34795000000000000
2013-01-01	5.22860000000000000
2014-01-01	4.88446999999999900
2015-01-01	4.93687000000000000
2016-01-01	4.80134000000000000