Year	Percent
1975-01-01	0.04492500000000000
1976-01-01	0.03560700000000000
1977-01-01	0.03092200000000000
1978-01-01	0.02639500000000000
1979-01-01	0.02154000000000000
1980-01-01	0.02154000000000000
1981-01-01	0.02154000000000000
1982-01-01	0.02154000000000000
1983-01-01	0.02154000000000000
1984-01-01	0.02154000000000000
1985-01-01	0.02154000000000000
1986-01-01	0.02154000000000000
1987-01-01	0.15169000000000002
1988-01-01	0.28256100000000000
1989-01-01	0.35729700000000000
1990-01-01	0.42072600000000004
1991-01-01	0.26489900000000000
1992-01-01	0.25875600000000000
1993-01-01	0.26249700000000000
1994-01-01	0.16014400000000000
1995-01-01	0.13054100000000002
1996-01-01	0.16276200000000000
1997-01-01	0.19443100000000000
1998-01-01	0.26270000000000000
1999-01-01	0.40795800000000000
2000-01-01	0.36503800000000003
2001-01-01	0.39565600000000000
2002-01-01	0.43135400000000000
2003-01-01	0.51818500000000000
2004-01-01	0.64278200000000000
2005-01-01	0.77819300000000000
2006-01-01	0.83930700000000000
2007-01-01	0.80405799999999990
2008-01-01	0.57582000000000000
2009-01-01	0.55912500000000000
2010-01-01	0.43249200000000000
2011-01-01	0.40660799999999997
2012-01-01	0.41145900000000000
2013-01-01	0.44029399999999996
2014-01-01	0.46722700000000006
2015-01-01	0.55449799999999990
2016-01-01	0.54088500000000010
2017-01-01	0.52398800000000000