Year	Percent
1960-01-01	3.5970800000000005
1961-01-01	3.2930400000000000
1962-01-01	2.4280600000000000
1963-01-01	1.4302800000000000
1964-01-01	1.0575000000000000
1965-01-01	1.3682299999999998
1966-01-01	1.8911500000000000
1967-01-01	2.1689800000000000
1968-01-01	2.3042700000000003
1969-01-01	2.4276400000000002
1970-01-01	2.5393000000000000
1971-01-01	2.8178300000000000
1972-01-01	2.6496800000000000
1973-01-01	3.4434300000000000
1974-01-01	3.9670900000000002
1975-01-01	4.1968800000000000
1976-01-01	4.5050500000000000
1977-01-01	3.8436800000000004
1978-01-01	2.9302700000000000
1979-01-01	2.5033700000000000
1980-01-01	3.0542100000000000
1981-01-01	4.1124000000000000
1982-01-01	3.9361200000000000
1983-01-01	3.2926400000000000
1984-01-01	1.9660799999999998
1985-01-01	0.9017890000000000
1986-01-01	0.8656469999999999
1987-01-01	0.7972970000000000
1988-01-01	0.9126600000000000
1989-01-01	1.1415400000000000
1990-01-01	1.9199400000000002
1991-01-01	2.6132100000000000
1992-01-01	2.2075400000000003
1993-01-01	1.8810300000000000
1994-01-01	2.3745900000000000
1995-01-01	2.2215500000000000
1996-01-01	1.8959000000000000
1997-01-01	1.9983600000000000
1998-01-01	1.7754200000000000
1999-01-01	1.4946700000000002
2000-01-01	1.2066100000000000
2001-01-01	1.0153700000000000
2002-01-01	2.6011400000000000
2003-01-01	3.6655300000000004
2004-01-01	2.5446100000000000
2005-01-01	1.5366000000000000
2006-01-01	0.8571570000000000
2007-01-01	0.6569310000000000
2008-01-01	0.5564479999999999
2009-01-01	0.5004920000000000
2010-01-01	0.3951310000000000
2011-01-01	0.7374480000000000
2012-01-01	1.0155700000000000
2013-01-01	1.0096399999999999
2014-01-01	1.1676700000000000
2015-01-01	1.2964500000000000
2016-01-01	1.4253700000000000