Year	Percent
1964-01-01	16.170200000000000000
1965-01-01	16.784800000000000000
1966-01-01	18.162000000000000000
1967-01-01	13.327200000000000000
1968-01-01	10.469600000000000000
1969-01-01	10.469600000000000000
1970-01-01	10.469600000000000000
1971-01-01	10.469600000000000000
1972-01-01	10.469600000000000000
1973-01-01	2.696040000000000000
1974-01-01	2.051580000000000000
1975-01-01	1.412060000000000000
1976-01-01	2.604130000000000000
1977-01-01	5.412650000000000000
1978-01-01	11.249700000000000000
1979-01-01	11.905200000000000000
1980-01-01	10.786200000000000000
1981-01-01	8.439960000000001000
1982-01-01	6.807720000000000000
1983-01-01	10.054200000000000000
1984-01-01	13.032300000000000000
1985-01-01	13.902200000000000000
1986-01-01	17.915600000000000000
1987-01-01	23.530300000000000000
1988-01-01	26.596400000000000000
1989-01-01	25.205500000000000000
1990-01-01	18.763600000000000000
1991-01-01	11.472400000000000000
1992-01-01	12.284900000000000000
1993-01-01	18.287600000000000000
1994-01-01	18.694500000000000000
1995-01-01	12.912000000000000000
1996-01-01	8.632340000000000000
1997-01-01	6.377900000000000000
1998-01-01	6.155760000000000000
1999-01-01	5.159500000000000000
2000-01-01	3.978020000000000000
2001-01-01	3.704090000000000300
2002-01-01	3.041709999999999700
2003-01-01	2.631160000000000000
2004-01-01	2.169020000000000000
2005-01-01	1.635560000000000100
2006-01-01	4.927340000000000000
2007-01-01	3.975780000000000300
2008-01-01	0.062719000000000010
2009-01-01	0.069788000000000000
2010-01-01	0.069952000000000000
2011-01-01	0.065982000000000000
2012-01-01	0.065846000000000000
2013-01-01	0.053861000000000000
2014-01-01	0.041513999999999995
2015-01-01	0.043288000000000000
2016-01-01	0.037980000000000000