Year	Percent
1960-01-01	0.05214571508333330
1961-01-01	0.02417897133333330
1962-01-01	0.02240939825000000
1963-01-01	0.03083044700000000
1964-01-01	0.01077944083333330
1965-01-01	0.01117198675000000
1966-01-01	0.01106917725000000
1967-01-01	0.00956753266666667
1968-01-01	0.01131529750000000
1969-01-01	0.00652374258333333
1970-01-01	0.00389119125000000
1971-01-01	0.00333525050000000
1972-01-01	0.00353831400000000
1973-01-01	0.00270380608333333
1974-01-01	0.00736592441666667
1975-01-01	0.33946952666666700
1976-01-01	0.69105611000000000
1977-01-01	0.40124537541666700
1978-01-01	0.34993147591666700
1979-01-01	0.34491051908333300
1980-01-01	0.20880503916666700
1981-01-01	0.19049157741666700
1982-01-01	0.42759190700000000
1983-01-01	0.85027280616666700
1984-01-01	1.13803845608333000
1985-01-01	0.98149536566666600
1986-01-01	0.83171771433333300
1987-01-01	0.79804146225000000
1988-01-01	0.71963784266666600
1989-01-01	0.56448018466666700
1990-01-01	0.50066046050000000
1991-01-01	1.08297880533333000
1992-01-01	2.54872276025000000
1993-01-01	4.50435649841667000
1994-01-01	4.72255417050000000
1995-01-01	4.23324652366667000
1996-01-01	4.65607785558333000
1997-01-01	5.19931021658333000
1998-01-01	3.85618309116667000
1999-01-01	2.72253079308333000
2000-01-01	1.82385488216667000
2001-01-01	1.70248807458333000
2002-01-01	2.54634884458333000
2003-01-01	3.69109305641667000
2004-01-01	3.87868757983333000
2005-01-01	3.76330634908333000
2006-01-01	3.33247360608333000
2007-01-01	2.76638160541667000
2008-01-01	2.57728382600000000
2009-01-01	3.70127592658333000
2010-01-01	3.51583316416667000
2011-01-01	2.84281450916667000
2012-01-01	2.90531307833333000
2013-01-01	3.15815844750000000
2014-01-01	3.04376076333333000
2015-01-01	3.17831447416667000
2016-01-01	3.32314109000000000
2017-01-01	3.18571831333333000