Year	Percent
1963-01-01	0.04752900000000000
1964-01-01	0.16127100000000000
1965-01-01	0.28872800000000004
1966-01-01	0.38089500000000000
1967-01-01	0.62354500000000000
1968-01-01	1.56837999999999990
1969-01-01	0.99301299999999990
1970-01-01	2.36985000000000000
1971-01-01	2.40358000000000000
1972-01-01	2.19997000000000000
1973-01-01	2.40847000000000000
1974-01-01	2.49239000000000030
1975-01-01	2.12385000000000000
1976-01-01	2.54590999999999970
1977-01-01	3.03834000000000030
1978-01-01	3.30237000000000000
1979-01-01	5.03146000000000000
1980-01-01	5.70176000000000000
1981-01-01	3.94308000000000000
1982-01-01	3.43279000000000020
1983-01-01	3.43279000000000020
1984-01-01	2.35482000000000000
1985-01-01	2.22218000000000000
1986-01-01	2.15642000000000020
1987-01-01	2.56102000000000000
1988-01-01	2.50295000000000000
1989-01-01	2.36881000000000000
1990-01-01	2.56607000000000000
1991-01-01	2.73350000000000000
1992-01-01	4.46935000000000000
1993-01-01	6.61178999999999900
1994-01-01	6.29136000000000000
1995-01-01	6.07458000000000000
1996-01-01	6.14757000000000000
1997-01-01	6.43872000000000000
1998-01-01	5.90935999999999950
1999-01-01	6.37142000000000000
2000-01-01	7.16104000000000000
2001-01-01	6.95208000000000050
2002-01-01	6.76781999999999950
2003-01-01	5.58909000000000100
2004-01-01	3.78849000000000040
2005-01-01	3.43420999999999980
2006-01-01	2.81674000000000020
2007-01-01	1.80515000000000000
2008-01-01	1.68645999999999980
2009-01-01	3.12117000000000000
2010-01-01	4.32293000000000000
2011-01-01	4.17943000000000000
2012-01-01	4.21650000000000000
2013-01-01	4.22602000000000000
2014-01-01	3.83958000000000000
2015-01-01	6.30045000000000000