Year	Percent
1960-01-01	0.2994672547696340
1961-01-01	0.9926762607673440
1962-01-01	1.4046070354350900
1963-01-01	2.1480034133220300
1964-01-01	4.1687605856436900
1965-01-01	4.0652013747464800
1966-01-01	4.1743476185299700
1967-01-01	2.7303026859090400
1968-01-01	2.7014498293135200
1969-01-01	3.7539922905328400
1970-01-01	3.9084723847190700
1971-01-01	4.3436285461209900
1972-01-01	5.4484312843807700
1973-01-01	6.9552800871991500
1974-01-01	12.6778877513452000
1975-01-01	12.7681985920515000
1976-01-01	9.0686098105496300
1977-01-01	7.0960005913259800
1978-01-01	4.4705933159294100
1979-01-01	4.4690839490048900
1980-01-01	6.6486882965535700
1981-01-01	7.6274865681427300
1982-01-01	8.7265490655546800
1983-01-01	7.6616098374387900
1984-01-01	6.3417749100912800
1985-01-01	4.8687339949694500
1986-01-01	1.2943681910248200
1987-01-01	1.5533826131494500
1988-01-01	1.1609349341532600
1989-01-01	3.1070506511109700
1990-01-01	3.4483121796180900
1991-01-01	3.2153106926080400
1992-01-01	2.4279556716462100
1993-01-01	2.7544264347345700
1994-01-01	2.3775408447640300
1995-01-01	1.4679669909027200
1996-01-01	2.0770210735066800
1997-01-01	1.6281604951296100
1998-01-01	0.9492502883506410
1999-01-01	1.1208482341784400
2000-01-01	2.5445177619090600
2001-01-01	2.4692582308607800
2002-01-01	1.6452143617535900
2003-01-01	1.5889639997037900
2004-01-01	2.0972831123931400
2005-01-01	2.7814326367002500
2006-01-01	1.7912077007045400
2007-01-01	1.8230563002681000
2008-01-01	4.4894442050840100
2009-01-01	-0.0531456741253762
2010-01-01	2.1892992042245800
2011-01-01	3.5320821072274400
2012-01-01	2.8396634344589700
2013-01-01	1.1130959402753700
2014-01-01	0.3400028333569650
2015-01-01	0.5614291527901060
2016-01-01	1.9738526465317200
2017-01-01	2.1259708600260900