Year	Percent
1965-01-01	5.6021100000000000
1966-01-01	5.2081700000000000
1967-01-01	5.7450100000000000
1968-01-01	6.7930300000000000
1969-01-01	7.8766399999999990
1970-01-01	4.7360300000000000
1971-01-01	4.9212600000000000
1972-01-01	5.4486200000000000
1973-01-01	4.9462500000000000
1974-01-01	4.7890000000000000
1975-01-01	5.0303100000000000
1976-01-01	5.7044100000000000
1977-01-01	6.5089200000000000
1978-01-01	7.5684700000000000
1979-01-01	11.8367000000000000
1980-01-01	10.0552000000000000
1981-01-01	9.7175300000000000
1982-01-01	9.3509200000000000
1983-01-01	9.1776300000000000
1984-01-01	8.2661900000000000
1985-01-01	6.5581500000000000
1986-01-01	5.9654800000000000
1987-01-01	5.1834900000000000
1988-01-01	4.0765000000000000
1989-01-01	4.6500500000000000
1990-01-01	5.7929699999999995
1991-01-01	5.5611100000000000
1992-01-01	6.9266600000000010
1993-01-01	5.2016400000000000
1994-01-01	4.9581599999999995
1995-01-01	3.4523200000000000
1996-01-01	2.2543200000000000
1997-01-01	2.0014000000000000
1998-01-01	2.5148400000000000
1999-01-01	2.7188300000000000
2000-01-01	2.6017700000000000
2001-01-01	2.8339900000000000
2002-01-01	2.5902000000000000
2003-01-01	2.7235300000000000
2004-01-01	3.0895900000000003
2005-01-01	3.5984500000000000
2006-01-01	4.1324200000000000
2007-01-01	4.9351000000000000
2008-01-01	6.6939600000000010
2009-01-01	9.2096100000000010
2010-01-01	11.3426000000000000
2011-01-01	12.6118000000000000
2012-01-01	12.8970000000000000
2013-01-01	11.5493000000000000
2014-01-01	10.6096000000000000
2015-01-01	10.4112000000000000
2016-01-01	9.9978000000000000