Year	Percent
1960-01-01	2.7693700000000000
1961-01-01	3.1087599999999997
1962-01-01	4.0507400000000000
1963-01-01	5.6184300000000000
1964-01-01	6.8137500000000000
1965-01-01	6.1647200000000000
1966-01-01	5.7407400000000000
1967-01-01	5.6813000000000000
1968-01-01	5.3125000000000000
1969-01-01	4.8047000000000000
1970-01-01	4.0461800000000006
1971-01-01	3.9789500000000000
1972-01-01	4.0433100000000000
1973-01-01	4.4867400000000000
1974-01-01	4.7834200000000000
1975-01-01	4.5671900000000000
1976-01-01	4.4689600000000000
1977-01-01	4.4056500000000000
1978-01-01	4.6624600000000000
1979-01-01	4.0433500000000000
1980-01-01	4.2156800000000000
1981-01-01	4.2168199999999990
1982-01-01	4.0557600000000000
1983-01-01	3.5597900000000000
1984-01-01	2.2866000000000000
1985-01-01	1.3469400000000000
1986-01-01	1.1893000000000000
1987-01-01	1.2507800000000000
1988-01-01	1.4007700000000000
1989-01-01	1.7921900000000002
1990-01-01	1.9793500000000000
1991-01-01	1.6509000000000000
1992-01-01	1.8427300000000000
1993-01-01	1.9713900000000002
1994-01-01	2.0123500000000000
1995-01-01	1.7638200000000002
1996-01-01	1.5008400000000000
1997-01-01	1.8562500000000000
1998-01-01	1.6751400000000000
1999-01-01	1.4505299999999999
2000-01-01	1.3204700000000000
2001-01-01	1.3851300000000000
2002-01-01	1.5873600000000000
2003-01-01	2.1812099999999996
2004-01-01	2.8717400000000000
2005-01-01	3.2297400000000000
2006-01-01	3.0356300000000000
2007-01-01	3.4798400000000003
2008-01-01	4.5316300000000010
2009-01-01	6.0726800000000000
2010-01-01	6.7691399999999990
2011-01-01	6.8460199999999990
2012-01-01	6.0336900000000000
2013-01-01	4.7829000000000000
2014-01-01	4.6592600000000000
2015-01-01	5.1954500000000000
2016-01-01	5.0657300000000000