Year	Percent
1975-01-01	0.062774000000000000
1976-01-01	0.074695000000000010
1977-01-01	0.139312000000000000
1978-01-01	0.180465000000000010
1979-01-01	0.205492999999999980
1980-01-01	0.197921000000000000
1981-01-01	0.182450000000000000
1982-01-01	0.203567000000000000
1983-01-01	0.190493000000000000
1984-01-01	0.093365999999999990
1985-01-01	0.090980999999999990
1986-01-01	0.100622000000000000
1987-01-01	0.084832000000000000
1988-01-01	0.096519000000000010
1989-01-01	0.059505999999999996
1990-01-01	0.044435000000000000
1991-01-01	0.079134000000000010
1992-01-01	0.091554000000000000
1993-01-01	0.086326000000000000
1994-01-01	0.064743000000000000
1995-01-01	0.055335000000000000
1996-01-01	0.110114000000000000
1997-01-01	0.185482999999999980
1998-01-01	0.280291000000000000
1999-01-01	0.328053000000000040
2000-01-01	0.376561000000000030
2001-01-01	0.379553000000000030
2002-01-01	0.341578000000000000
2003-01-01	0.307448000000000000
2004-01-01	0.338687000000000000
2005-01-01	0.338796999999999960
2006-01-01	0.329947000000000000
2007-01-01	0.315636000000000000
2008-01-01	0.338042000000000000
2009-01-01	0.343959000000000000
2010-01-01	0.360790000000000000
2011-01-01	0.276084000000000000
2012-01-01	0.335959000000000000
2013-01-01	0.360487000000000000
2014-01-01	0.332723999999999960
2015-01-01	0.372170000000000000
2016-01-01	0.348616000000000000
2017-01-01	0.349607000000000000