Year	Percent
1960-01-01	0.45083726943176600
1961-01-01	2.75699935863550000
1962-01-01	4.26372712149085000
1963-01-01	2.45362058668927000
1964-01-01	6.71728971926296000
1965-01-01	4.98812351543950000
1966-01-01	3.05429864140272000
1967-01-01	3.18331503955179000
1968-01-01	4.68085106382992000
1969-01-01	7.41869918597552000
1970-01-01	8.20719016091025000
1971-01-01	8.96174863417671000
1972-01-01	8.60581745301067000
1973-01-01	11.41485038732960000
1974-01-01	16.97612732120480000
1975-01-01	20.87585034019520000
1976-01-01	17.98569586133850000
1977-01-01	13.47222526339270000
1978-01-01	7.71114118004808000
1979-01-01	13.29545398526120000
1980-01-01	18.15444330381920000
1981-01-01	20.37352289477730000
1982-01-01	17.14711420321240000
1983-01-01	10.44762952408310000
1984-01-01	8.65111383765405000
1985-01-01	5.39549731466383000
1986-01-01	3.82703931524415000
1987-01-01	3.15940764053431000
1988-01-01	2.13457156859609000
1989-01-01	4.08904273020372000
1990-01-01	3.31732129894252000
1991-01-01	3.21081702751349000
1992-01-01	3.06999743466961000
1993-01-01	1.46942088431732000
1994-01-01	2.30919875061488000
1995-01-01	2.52486728005296000
1996-01-01	1.75373213896016000
1997-01-01	1.52560521714534000
1998-01-01	2.41551787239232000
1999-01-01	1.63192376414532000
2000-01-01	5.59071729957807000
2001-01-01	4.87290487290487000
2002-01-01	4.61473327688400000
2003-01-01	3.49048968029138000
2004-01-01	2.19962850718543000
2005-01-01	2.42969198392961000
2006-01-01	3.93163989540532000
2007-01-01	4.89711564381346000
2008-01-01	4.06030495117353000
2009-01-01	-4.47810339150477000
2010-01-01	-0.92209582902446900
2011-01-01	2.55718883186920000
2012-01-01	1.69620897294545000
2013-01-01	0.50871486948543600
2014-01-01	0.18254231662794900
2015-01-01	-0.28987907901273900
2016-01-01	0.00830633773569926
2017-01-01	0.34053156146179300