Year	Percent
1967-01-01	5.437756499047980
1968-01-01	4.541031462875640
1969-01-01	8.935774122894330
1970-01-01	6.152093421300480
1971-01-01	4.614971826682520
1972-01-01	6.830811319023670
1973-01-01	5.481754161698970
1974-01-01	13.071845838701300
1975-01-01	10.359634997305100
1976-01-01	4.255836575838080
1977-01-01	3.189876370557500
1978-01-01	6.109070358998690
1979-01-01	9.091393267924120
1980-01-01	12.097837231068200
1981-01-01	11.114498497389100
1982-01-01	6.012621016674970
1983-01-01	3.999999999999950
1984-01-01	3.966346153846140
1985-01-01	4.605009633911370
1986-01-01	5.433781543562330
1987-01-01	5.756464011181360
1988-01-01	4.402411827867620
1989-01-01	5.387658227848080
1990-01-01	4.669319120186760
1991-01-01	7.114681202036260
1992-01-01	5.738198861734490
1993-01-01	2.722897669705890
1994-01-01	1.399334237455490
1995-01-01	2.066994954100410
1996-01-01	1.379137412236670
1997-01-01	0.544150383378706
1998-01-01	1.336613366133680
1999-01-01	1.254248260236310
2000-01-01	1.606329417405800
2001-01-01	2.044989775051210
2002-01-01	2.173577925080910
2003-01-01	3.025045262522360
2004-01-01	0.981914036757665
2005-01-01	1.591606180798030
2006-01-01	2.389826274392530
2007-01-01	2.492577949393990
2008-01-01	4.489559953750590
2009-01-01	2.062734734526800
2010-01-01	1.344027383928360
2011-01-01	3.198781416603210
2012-01-01	1.973367559762550
2013-01-01	0.722414784530555
2014-01-01	1.506998589300640
2015-01-01	1.868264469687510
2016-01-01	-0.346376929989402
2017-01-01	1.518207007361530