Year	Percent
1966-01-01	0.026900999999999998
1967-01-01	0.023555000000000000
1968-01-01	0.023555000000000000
1969-01-01	0.023555000000000000
1970-01-01	0.023555000000000000
1971-01-01	0.023555000000000000
1972-01-01	0.023555000000000000
1973-01-01	0.023555000000000000
1974-01-01	0.023555000000000000
1975-01-01	6.592980000000001000
1976-01-01	6.242100000000000000
1977-01-01	7.729719999999999500
1978-01-01	6.824540000000000000
1979-01-01	5.790669999999999500
1980-01-01	8.021920000000000000
1981-01-01	9.751700000000000000
1982-01-01	10.084400000000000000
1983-01-01	10.699600000000000000
1984-01-01	9.941430000000000000
1985-01-01	9.785900000000000000
1986-01-01	9.658160000000000000
1987-01-01	12.711400000000000000
1988-01-01	20.702200000000000000
1989-01-01	30.094900000000000000
1990-01-01	27.186700000000000000
1991-01-01	24.474200000000000000
1992-01-01	18.785600000000000000
1993-01-01	17.937700000000000000
1994-01-01	17.139800000000000000
1995-01-01	15.290600000000000000
1996-01-01	13.949400000000000000
1997-01-01	13.174400000000000000
1998-01-01	12.248100000000000000
1999-01-01	11.669700000000000000
2000-01-01	12.088800000000000000
2001-01-01	12.513600000000000000
2002-01-01	10.703100000000000000
2003-01-01	9.009640000000000000
2004-01-01	7.972270000000000000
2005-01-01	8.621290000000000000
2006-01-01	7.300680000000001000
2007-01-01	5.207350000000000000
2008-01-01	6.299150000000000000
2009-01-01	7.250530000000000000
2010-01-01	6.177450000000000000
2011-01-01	5.707540000000000000
2012-01-01	7.466289999999999000
2013-01-01	7.837980000000000000
2014-01-01	5.632650000000000000
2015-01-01	4.141850000000000000
2016-01-01	3.589819999999999600