Year	Percent
1960-01-01	2.3501614137704800
1961-01-01	2.0506973127869100
1962-01-01	4.6911436074047400
1963-01-01	7.4547182253910700
1964-01-01	5.9123225321858100
1965-01-01	4.5192683074346700
1966-01-01	2.3465889341331900
1967-01-01	3.7333383207382300
1968-01-01	1.2773133539079600
1969-01-01	2.6572527338696700
1970-01-01	4.9683198732933700
1971-01-01	4.7916643833378500
1972-01-01	5.7495039373001500
1973-01-01	10.7986174547601000
1974-01-01	19.1597695854699000
1975-01-01	16.9505025668306000
1976-01-01	16.6141664725788000
1977-01-01	17.1300487866500000
1978-01-01	12.0940138425074000
1979-01-01	14.7985735661485000
1980-01-01	21.0641682770745000
1981-01-01	17.9692987519672000
1982-01-01	16.4804146202215000
1983-01-01	14.6465766748770000
1984-01-01	10.7944960076810000
1985-01-01	9.2059914425311900
1986-01-01	5.8235469186201800
1987-01-01	4.7472849038979000
1988-01-01	5.0582474766712100
1989-01-01	6.2598313795697300
1990-01-01	6.4566090614640500
1991-01-01	6.2499992979029100
1992-01-01	5.2705899859293200
1993-01-01	4.6267346833129300
1994-01-01	4.0518421806572000
1995-01-01	5.2354225804429900
1996-01-01	4.0069766898103900
1997-01-01	2.0431077975013300
1998-01-01	1.9550855771938300
1999-01-01	1.6634599500771400
2000-01-01	2.5376853209500500
2001-01-01	2.7851654271355500
2002-01-01	2.4653231917116400
2003-01-01	2.6725555277285200
2004-01-01	2.2067366142365400
2005-01-01	1.9852929852798300
2006-01-01	2.0908439101275500
2007-01-01	1.8297411220240000
2008-01-01	3.3478325840102300
2009-01-01	0.7747681313873840
2010-01-01	1.5255160211824800
2011-01-01	2.7806327287932400
2012-01-01	3.0413633322677300
2013-01-01	1.2199934227430500
2014-01-01	0.2410474298267730
2015-01-01	0.0387903996579552
2016-01-01	-0.0940166569157271
2017-01-01	1.2265331664580800