Year	Percent
1960-01-01	0.153609831029186
1962-01-01	0.149031296572280
1963-01-01	0.146198830409357
1964-01-01	0.142857142857143
1965-01-01	0.139275766016713
1966-01-01	0.000000000000000
1967-01-01	0.133511348464619
1968-01-01	0.939597315436242
1969-01-01	0.265604249667995
1970-01-01	0.130208333333333
1971-01-01	0.130378096479791
1972-01-01	0.514800514800515
1973-01-01	0.125470514429109
1974-01-01	0.121951219512195
1975-01-01	0.240096038415366
1976-01-01	0.237247924080664
1977-01-01	0.236127508854782
1978-01-01	1.411764705882350
1979-01-01	1.760563380281690
1980-01-01	1.988304093567250
1981-01-01	3.255813953488370
1982-01-01	2.991944764096660
1983-01-01	5.275229357798160
1984-01-01	5.359179019384260
1985-01-01	3.850509626274070
1986-01-01	3.675000000000000
1987-01-01	4.050000000000000
1988-01-01	5.850000000000000
1989-01-01	7.450000000000000
1990-01-01	8.375000000000000
1991-01-01	11.275000000000000
1992-01-01	11.375000000000000
1993-01-01	10.475000000000000
1994-01-01	8.800000000000000
1995-01-01	6.450000000000000
1996-01-01	6.300000000000000
1997-01-01	6.875000000000000
1998-01-01	7.825000000000000
1999-01-01	7.325000000000000
2000-01-01	6.250000000000000
2001-01-01	5.475000000000000
2002-01-01	5.150000000000000
2003-01-01	4.425000000000000
2004-01-01	3.575000000000000
2005-01-01	3.525000000000000
2006-01-01	3.525000000000000
2007-01-01	3.350000000000000
2008-01-01	3.925000000000000
2009-01-01	5.825000000000000
2010-01-01	5.875000000000000
2011-01-01	5.800000000000000
2012-01-01	6.150000000000000
2013-01-01	5.225000000000000
2014-01-01	4.725000000000000
2015-01-01	4.900000000000000
2016-01-01	4.775000000000000
2017-01-01	4.225000000000000