Year	Percent
1975-01-01	0.17403200000000000
1976-01-01	0.17539200000000002
1977-01-01	0.30728000000000000
1978-01-01	0.31223600000000000
1979-01-01	0.31294600000000000
1980-01-01	0.20538800000000001
1981-01-01	0.20766700000000002
1982-01-01	0.22874600000000000
1983-01-01	0.22843500000000000
1984-01-01	0.23783400000000002
1985-01-01	0.25191800000000000
1986-01-01	0.26195700000000000
1987-01-01	0.26467399999999996
1988-01-01	0.33551200000000000
1989-01-01	0.31446000000000000
1990-01-01	0.31790300000000005
1991-01-01	0.36394800000000000
1992-01-01	0.37196900000000000
1993-01-01	0.38039500000000000
1994-01-01	0.28364100000000000
1995-01-01	0.27695400000000000
1996-01-01	0.26997400000000000
1997-01-01	0.67046500000000000
1998-01-01	0.66668900000000010
1999-01-01	0.63285800000000000
2000-01-01	0.65110400000000000
2001-01-01	0.66776200000000000
2002-01-01	0.70862100000000010
2003-01-01	0.66405800000000000
2004-01-01	0.63017500000000000
2005-01-01	0.64715000000000000
2006-01-01	0.66975299999999990
2007-01-01	0.66194900000000000
2008-01-01	0.68823500000000000
2009-01-01	0.73039000000000000
2010-01-01	0.75316300000000000
2011-01-01	0.80125900000000000
2012-01-01	0.84485499999999990
2013-01-01	0.86845699999999990
2014-01-01	0.88883899999999990
2015-01-01	0.97472000000000000
2016-01-01	0.98871200000000000
2017-01-01	0.96518799999999990