Year	Percent
1960-01-01	4.1399357551843000
1961-01-01	2.4004610454632000
1962-01-01	5.3312800706563800
1963-01-01	4.9991528979685200
1964-01-01	3.2111917029310000
1965-01-01	2.7031045587308000
1966-01-01	2.6020007663645300
1967-01-01	2.7917770943514400
1968-01-01	4.5432048640201400
1969-01-01	6.0459628417389300
1970-01-01	5.2996412456267200
1971-01-01	5.3975186559511000
1972-01-01	6.0630030971818900
1973-01-01	7.3806010639891300
1974-01-01	13.6493174728138000
1975-01-01	11.6859272493228000
1976-01-01	9.6254957815552900
1977-01-01	9.4945546719042900
1978-01-01	9.2505584672443700
1979-01-01	10.6467341716663000
1980-01-01	13.5625788483016000
1981-01-01	13.3144055680071000
1982-01-01	11.9784719523805000
1983-01-01	9.4595484723531400
1984-01-01	7.6738026224732000
1985-01-01	5.8310997385451600
1986-01-01	2.5385259178141600
1987-01-01	3.2888982140013600
1988-01-01	2.7008152750811100
1989-01-01	3.4983022070074800
1990-01-01	3.1942833802948100
1991-01-01	3.2134073240968500
1992-01-01	2.3637604626935400
1993-01-01	2.1044627712464100
1994-01-01	1.6555153292699600
1995-01-01	1.7964814209559500
1996-01-01	1.9828836508973600
1997-01-01	1.2039429402696600
1998-01-01	0.6511268678330200
1999-01-01	0.5371416391346130
2000-01-01	1.6759598872093000
2001-01-01	1.6347807954959900
2002-01-01	1.9234122872706000
2003-01-01	2.0984721914692200
2004-01-01	2.1420896464024200
2005-01-01	1.7458693638048100
2006-01-01	1.6751244960872800
2007-01-01	1.4879980595385800
2008-01-01	2.8128619491478700
2009-01-01	0.0876204781574529
2010-01-01	1.5311227042092400
2011-01-01	2.1115979517499700
2012-01-01	1.9541953161350700
2013-01-01	0.8637154978618260
2014-01-01	0.5077588229379570
2015-01-01	0.0375143805125363
2016-01-01	0.1833348611238480
2017-01-01	1.0322827506467400