Year	Percent
1977-01-01	0.1741180000000000
1978-01-01	0.1913980000000000
1979-01-01	0.2945310000000000
1980-01-01	0.2945310000000000
1981-01-01	0.2945310000000000
1982-01-01	0.2945310000000000
1983-01-01	0.2945310000000000
1984-01-01	0.2945310000000000
1985-01-01	0.2945310000000000
1986-01-01	0.2945310000000000
1987-01-01	0.2945310000000000
1988-01-01	0.2945310000000000
1989-01-01	0.2945310000000000
1990-01-01	0.2945310000000000
1991-01-01	0.2945310000000000
1992-01-01	0.5577870000000000
1993-01-01	1.4233200000000001
1994-01-01	1.2942700000000000
1995-01-01	1.8113900000000000
1996-01-01	2.2050200000000000
1997-01-01	3.4168800000000004
1998-01-01	4.3147500000000000
1999-01-01	6.1782800000000000
2000-01-01	6.2655100000000000
2001-01-01	6.3064200000000000
2002-01-01	7.2068300000000000
2003-01-01	8.2443200000000000
2004-01-01	8.9516700000000000
2005-01-01	9.7400300000000000
2006-01-01	10.3124000000000000
2007-01-01	9.9631200000000000
2008-01-01	9.6493300000000000
2009-01-01	9.2821800000000000
2010-01-01	9.4170100000000010
2011-01-01	9.3469400000000000
2012-01-01	9.6496400000000000
2013-01-01	9.8452399999999990
2014-01-01	9.5972900000000000
2015-01-01	9.4956100000000010
2016-01-01	9.6177500000000000
2017-01-01	10.0961000000000000