Year	Percent
1965-01-01	7.020252403914200
1966-01-01	9.019216204344020
1967-01-01	4.500319483161000
1968-01-01	2.088137144261360
1969-01-01	3.622289209276240
1970-01-01	5.608398493744910
1971-01-01	2.873242890887950
1972-01-01	6.405512255837200
1973-01-01	14.178965536258000
1974-01-01	23.234686440916900
1975-01-01	7.105988883369750
1976-01-01	-0.891858526344835
1977-01-01	9.110236092638400
1978-01-01	6.742391959130180
1979-01-01	7.260105766568770
1980-01-01	13.311366843542800
1981-01-01	11.879913592528300
1982-01-01	9.904430929626090
1983-01-01	12.377238078271300
1984-01-01	7.032819825853940
1985-01-01	5.555555555555010
1986-01-01	8.730811403508890
1987-01-01	8.257927313070040
1988-01-01	9.183889595111690
1989-01-01	8.311445345799510
1990-01-01	9.011682548705160
1991-01-01	12.233166237912400
1992-01-01	11.585628152329500
1993-01-01	8.739529475581560
1994-01-01	8.398999607908650
1995-01-01	9.860256438944570
1996-01-01	9.098807849425700
1997-01-01	6.838769713220240
1998-01-01	9.970631796489910
1999-01-01	5.399200764451950
2000-01-01	4.010213846201260
2001-01-01	3.279333035091780
2002-01-01	3.311454829425330
2003-01-01	4.737286828101230
2004-01-01	5.605931586538880
2005-01-01	7.046618162220380
2006-01-01	6.842798488811730
2007-01-01	7.196728974904670
2008-01-01	10.974644201787900
2009-01-01	4.976824476537390
2010-01-01	7.581529776214680
2011-01-01	9.714367801420910
2012-01-01	9.386127704222420
2013-01-01	7.592144695347460
2014-01-01	6.824371575114410
2015-01-01	4.158255890721430
2016-01-01	4.345142935208090
2017-01-01	3.858200035398820