Year	Percent
1960-01-01	5.7085800000000000
1961-01-01	5.6469500000000000
1962-01-01	6.4610400000000010
1963-01-01	6.4610400000000010
1964-01-01	6.4610400000000010
1965-01-01	6.4610400000000010
1966-01-01	6.4610400000000010
1967-01-01	9.0564100000000010
1968-01-01	10.0818000000000000
1969-01-01	10.8215000000000000
1970-01-01	8.5369800000000000
1971-01-01	8.3975900000000000
1972-01-01	8.7272300000000000
1973-01-01	10.0242000000000000
1974-01-01	12.8399000000000000
1975-01-01	14.3452000000000000
1976-01-01	11.8179000000000000
1977-01-01	10.4421000000000000
1978-01-01	11.5579000000000000
1979-01-01	14.5670000000000000
1980-01-01	15.5205000000000000
1981-01-01	16.7814000000000000
1982-01-01	16.7890000000000000
1983-01-01	16.4468000000000000
1984-01-01	18.2965000000000000
1985-01-01	16.8955000000000000
1986-01-01	17.3208000000000000
1987-01-01	16.7151000000000000
1988-01-01	16.1407000000000000
1989-01-01	14.2556000000000000
1990-01-01	12.8411000000000000
1991-01-01	11.6892000000000000
1992-01-01	11.7900000000000000
1993-01-01	10.9938000000000000
1994-01-01	8.9967399999999990
1995-01-01	6.6261199999999990
1996-01-01	4.5398700000000000
1997-01-01	3.9717800000000003
1998-01-01	3.7188199999999996
1999-01-01	4.0955699999999995
2000-01-01	4.6311200000000000
2001-01-01	4.8398400000000010
2002-01-01	5.0106300000000000
2003-01-01	5.2060600000000000
2004-01-01	5.9905700000000000
2005-01-01	6.4631400000000000
2006-01-01	7.4567500000000000
2007-01-01	8.4470800000000000
2008-01-01	9.3981000000000000
2009-01-01	10.9724000000000000
2010-01-01	11.4904000000000000
2011-01-01	12.3690000000000020
2012-01-01	12.6326000000000000
2013-01-01	13.5408000000000000
2014-01-01	13.3591000000000000
2015-01-01	14.2620000000000000
2016-01-01	14.7809000000000000