Year	Percent
1967-01-01	0.9524565442554540
1968-01-01	5.3699190185796500
1969-01-01	4.2157886885082300
1970-01-01	12.3934989618915000
1971-01-01	3.6374060388717800
1972-01-01	3.6879955745473800
1973-01-01	12.0991167230852000
1974-01-01	34.3760742523204000
1975-01-01	19.9027884369402000
1976-01-01	10.9024962662686000
1977-01-01	9.5036552520199800
1978-01-01	7.7125790583272500
1981-01-01	13.2666874934914000
1982-01-01	4.3945940976373800
1983-01-01	4.1479524438573300
1984-01-01	2.2179942499574000
1985-01-01	3.7399799806423900
1986-01-01	2.7742336767570400
1987-01-01	4.0245804334163800
1988-01-01	2.9245916312373900
1989-01-01	6.2185214977786000
1990-01-01	3.1909232322682100
1991-01-01	5.5570615342913300
1992-01-01	5.4718255934417600
1993-01-01	1.5690260422449800
1994-01-01	0.0151367351744379
1995-01-01	1.3175374577497000
1996-01-01	1.6771645048591300
1997-01-01	2.4362971547967400
1998-01-01	0.9991474579107300
1999-01-01	1.1794778739417700
2000-01-01	0.8569468053584810
2001-01-01	1.3038940346596000
2002-01-01	0.1700553301973300
2003-01-01	1.4533680043724500
2004-01-01	2.3941098205033900
2005-01-01	1.6819007987754600
2006-01-01	2.5928209094017900
2007-01-01	3.2378361442465700
2008-01-01	6.3347545449164900
2009-01-01	0.0299330335386662
2010-01-01	3.2074434400158300
2011-01-01	1.1312313652647400
2012-01-01	1.3567714780886400
2013-01-01	-0.0464116468806453
2014-01-01	0.7992503726875130
2015-01-01	-0.7864477461743760
2016-01-01	0.2313362929173580
2017-01-01	0.3510796511958650