Year	Percent
1960-01-01	3.424299065420560
1961-01-01	1.763124604934530
1962-01-01	5.096729081381480
1963-01-01	5.699711687452210
1964-01-01	4.021541474212100
1965-01-01	3.482821220016950
1966-01-01	-1.013579364696440
1967-01-01	-0.748276993897750
1968-01-01	0.436479069044563
1969-01-01	2.949891354392500
1970-01-01	1.279181323764700
1971-01-01	4.155352068353280
1972-01-01	3.759170557222670
1973-01-01	4.084614036129720
1974-01-01	17.556822745245400
1975-01-01	7.918289267027400
1976-01-01	8.502152443493060
1977-01-01	12.597000992006900
1978-01-01	9.716032749543410
1979-01-01	8.331365418154610
1980-01-01	9.408379474379540
1981-01-01	12.492528392100100
1982-01-01	10.527807297298300
1983-01-01	6.207935388703110
1984-01-01	12.447569329185400
1985-01-01	7.728638900859190
1986-01-01	8.733559187066760
1987-01-01	2.698739977137670
1988-01-01	2.369055054876420
1989-01-01	3.259969492263890
1990-01-01	6.782594015110090
1991-01-01	7.986166007905100
1992-01-01	5.740246628687420
1993-01-01	5.183113960308040
1994-01-01	5.141671529533580
1995-01-01	6.123581647755240
1996-01-01	2.986809227730170
1997-01-01	1.038198950516120
1998-01-01	2.753113307644770
1999-01-01	0.684782608695647
2000-01-01	1.894634567634670
2001-01-01	0.619801875297956
2002-01-01	2.795619669369370
2003-01-01	1.167733674775910
2004-01-01	1.493444033817740
2005-01-01	0.982641660015941
2006-01-01	3.284761669548130
2007-01-01	2.042085126733480
2008-01-01	3.707317073170720
2009-01-01	0.994825964252083
2010-01-01	0.987355331485952
2011-01-01	0.914610714011218
2012-01-01	1.287128712871270
2013-01-01	1.872321227159930
2014-01-01	0.442869796279899
2015-01-01	1.557907113462690
2016-01-01	1.635311143270610
2017-01-01	0.754663249323633