Year	Percent
1967-01-01	3.207179087185300
1968-01-01	5.369919018579650
1969-01-01	5.835231866054910
1970-01-01	7.284216373685230
1971-01-01	4.614971826682520
1972-01-01	6.830811319023670
1973-01-01	13.440600697174100
1974-01-01	27.158189455021700
1975-01-01	17.177603627134800
1976-01-01	9.931595652813020
1977-01-01	9.731132768537370
1978-01-01	9.482382591017630
1979-01-01	14.782239267266000
1980-01-01	17.470304279577200
1981-01-01	12.739718114509100
1982-01-01	6.839032527162880
1983-01-01	4.996096799804850
1984-01-01	3.688744527609080
1985-01-01	3.915105250827940
1986-01-01	2.190258254331310
1987-01-01	4.024580433416380
1988-01-01	4.000000000000120
1989-01-01	5.387658227848080
1990-01-01	4.267556628559720
1991-01-01	5.557061534291330
1992-01-01	5.471825593441760
1993-01-01	2.722897669705890
1994-01-01	2.569343046442960
1995-01-01	2.923208047323860
1996-01-01	2.236363040057230
1997-01-01	2.995984030292420
1998-01-01	2.698602958583400
1999-01-01	2.621395245827470
2000-01-01	2.435813034891380
2001-01-01	2.577834904312890
2002-01-01	2.173577925080910
2003-01-01	2.235436643745530
2004-01-01	2.394109820503390
2005-01-01	3.733429164669850
2006-01-01	4.251953219779680
2007-01-01	4.034229828850690
2008-01-01	8.033273276503430
2009-01-01	0.421539125686921
2010-01-01	3.250344091801260
2011-01-01	3.456749672345990
2012-01-01	2.598444141470860
2013-01-01	1.106985540001400
2014-01-01	1.201399644810450
2015-01-01	-0.786447746174376
2016-01-01	0.661168347244125
2017-01-01	1.699295704598410