Year	Percent
1960-01-01	0.0511770724157644
1961-01-01	0.6138107419467530
1962-01-01	0.7880020335559050
1963-01-01	0.4498875281199840
1964-01-01	2.4135357049137500
1965-01-01	0.4616132167198710
1966-01-01	0.1934703750925820
1967-01-01	1.3758146270917800
1968-01-01	1.6190476195354800
1969-01-01	1.8275538894135800
1970-01-01	3.0832949836702700
1971-01-01	1.9196428571514200
1972-01-01	5.4095488394892700
1973-01-01	6.8564305005337600
1974-01-01	16.2680666277125000
1975-01-01	5.8810413065094600
1976-01-01	3.9499999994171900
1977-01-01	4.5855379188961600
1978-01-01	4.2005212326609500
1979-01-01	7.9888185961076900
1980-01-01	13.8079019078008000
1981-01-01	7.3023283652621900
1982-01-01	4.2505717632812200
1983-01-01	2.1028412436816700
1984-01-01	1.5826433285859100
1985-01-01	1.0266198927515700
1986-01-01	-0.0663841083593885
1987-01-01	0.9964230966792040
1988-01-01	0.3592208449281730
1989-01-01	0.2058672583177210
1990-01-01	0.7694853549560450
1991-01-01	1.2562607767468700
1992-01-01	1.8245215698995700
1993-01-01	0.4539300788403860
1994-01-01	1.2684319010619500
1995-01-01	0.9942069829338750
1996-01-01	1.2557166111154400
1997-01-01	1.3243512210060900
1998-01-01	0.5590812934424990
1999-01-01	1.2471825694963500
2000-01-01	1.4989611160577600
2001-01-01	0.3070624360287260
2002-01-01	1.0058309037904100
2003-01-01	0.3916666666666770
2004-01-01	0.1826180791898120
2005-01-01	3.1817051951280600
2006-01-01	2.4578933314338900
2007-01-01	4.1686331647715400
2008-01-01	8.7586830879568100
2009-01-01	2.4090531666970500
2010-01-01	3.4912886748752400
2011-01-01	5.8758024998975500
2012-01-01	5.6981994030786500
2013-01-01	4.0271605344298600
2014-01-01	2.6309311535120000
2015-01-01	0.1322554494982630
2016-01-01	0.7397340253000150
2017-01-01	0.8755859187599050