Year	Percent
1970-01-01	0.45277399999999995
1971-01-01	0.40823400000000004
1972-01-01	0.65772000000000000
1973-01-01	0.50117100000000000
1974-01-01	0.62153000000000000
1975-01-01	0.40498900000000000
1976-01-01	0.28493000000000000
1977-01-01	0.41118000000000005
1978-01-01	0.49776200000000000
1979-01-01	0.30700700000000003
1980-01-01	0.38153899999999996
1981-01-01	1.14582000000000000
1982-01-01	1.05697000000000000
1983-01-01	0.97136800000000000
1984-01-01	0.91675000000000000
1985-01-01	1.07579000000000000
1986-01-01	0.72025299999999990
1987-01-01	0.82802000000000010
1988-01-01	0.91629599999999990
1989-01-01	1.07568000000000000
1990-01-01	1.62452000000000000
1991-01-01	1.52217999999999990
1992-01-01	1.39893000000000000
1993-01-01	2.05397000000000000
1994-01-01	1.92050000000000000
1995-01-01	0.96722000000000010
1996-01-01	0.72674700000000000
1997-01-01	3.86264000000000030
1998-01-01	3.77404000000000030
1999-01-01	4.53515999999999900
2000-01-01	4.23365000000000000
2001-01-01	0.39207100000000000
2002-01-01	0.43462600000000000
2003-01-01	0.44178100000000003
2004-01-01	2.33491000000000000
2005-01-01	2.26808000000000000
2006-01-01	2.20890000000000000
2007-01-01	2.01891000000000000
2008-01-01	1.85907000000000000
2009-01-01	1.70566000000000000
2010-01-01	1.71439000000000000
2011-01-01	2.22655000000000000
2012-01-01	2.40594000000000000
2013-01-01	2.36725000000000000
2014-01-01	2.34482000000000000
2015-01-01	2.45170000000000000
2016-01-01	2.46156000000000000
2017-01-01	2.61944000000000000