Year	Percent
1964-01-01	1.895574172810010
1965-01-01	1.785565982982240
1966-01-01	2.504895560958430
1967-01-01	1.878532197816480
1968-01-01	6.977107586729670
1969-01-01	2.315220566764750
1970-01-01	1.541865943256670
1971-01-01	0.316344463692509
1972-01-01	5.395935529334080
1973-01-01	13.450797872677600
1974-01-01	29.115630311092000
1975-01-01	14.738323271755000
1976-01-01	12.955729167183600
1977-01-01	9.172498970747990
1978-01-01	8.545139150822860
1979-01-01	14.466370205830300
1980-01-01	41.999514386569800
1981-01-01	14.461591074210600
1982-01-01	11.415693128365100
1983-01-01	5.589498018439470
1984-01-01	7.389162561694640
1985-01-01	6.698703946585000
1986-01-01	1.632653061224800
1987-01-01	0.518741633199869
1988-01-01	9.159314133510580
1989-01-01	12.670042091136000
1990-01-01	13.488088792637100
1991-01-01	7.001013775418850
1992-01-01	4.643519298837080
1993-01-01	10.517838447289600
1994-01-01	7.323471544122960
1995-01-01	6.029331884845300
1996-01-01	6.550973360655700
1997-01-01	6.833343349961050
1998-01-01	6.810793237971940
1999-01-01	6.909146248667770
2000-01-01	4.199288256228040
2001-01-01	5.389344262295100
2002-01-01	6.419333722211470
2003-01-01	3.921053575581930
2004-01-01	4.710370601058880
2005-01-01	4.937170049817840
2006-01-01	8.913501056501440
2007-01-01	8.827292723932970
2008-01-01	9.732283171468800
2009-01-01	2.516091281451130
2010-01-01	2.932363013698650
2011-01-01	6.522492548693390
2012-01-01	3.852160333159810
2013-01-01	3.543295739348350
2014-01-01	3.217691919946830
2015-01-01	1.286549707602350
2016-01-01	0.977675134719017
2017-01-01	3.666997026759170