Year	Percent
1960-01-01	1.5366170397887100
1961-01-01	2.1035616620351200
1962-01-01	4.1964996868102600
1963-01-01	2.8763224621267100
1964-01-01	3.3876623108835000
1965-01-01	4.0652013747464800
1966-01-01	3.8736540186132600
1967-01-01	3.1833150395517900
1968-01-01	3.7207917707475800
1969-01-01	2.6919945855570200
1970-01-01	4.6393534438994200
1971-01-01	5.3192492491258400
1972-01-01	6.0351963979034200
1973-01-01	7.8088823405225700
1974-01-01	13.6493174728138000
1975-01-01	10.7176711339198000
1976-01-01	9.6254957815552900
1977-01-01	10.0403748002364000
1978-01-01	7.7993507455214600
1979-01-01	8.9764123470030000
1980-01-01	13.5175605772584000
1981-01-01	11.8220013455650000
1982-01-01	9.4709893205241400
1983-01-01	8.5177821022707800
1984-01-01	7.3707295028774700
1985-01-01	5.6132985266045000
1986-01-01	3.5529006106306600
1987-01-01	4.0665111594410500
1988-01-01	4.2239631467051500
1989-01-01	5.7172812811827100
1990-01-01	6.3030871866313000
1991-01-01	5.9342111131883200
1992-01-01	5.5975621366355900
1993-01-01	4.7911698564637600
1994-01-01	4.7085012971853300
1995-01-01	4.3247308219307100
1996-01-01	3.3139090781354200
1997-01-01	2.7244704513369200
1998-01-01	2.4003846132844800
1999-01-01	2.1463138123619300
2000-01-01	3.0964339384519400
2001-01-01	3.1517297168119100
2002-01-01	2.3064635464012100
2003-01-01	2.0835382982208100
2004-01-01	2.2559481161528500
2005-01-01	2.4695989874028000
2006-01-01	2.6001537646035200
2007-01-01	2.4847043881286800
2008-01-01	4.1588846912887800
2009-01-01	0.9293198000430700
2010-01-01	1.6655020173393200
2011-01-01	3.3098089053647400
2012-01-01	2.7180900977979800
2013-01-01	1.3876899463659400
2014-01-01	0.2201956281988110
2015-01-01	-0.0542147125236914
2016-01-01	0.2166674305619230
2017-01-01	1.5799535121909700