Year	Percent
1960-01-01	1.177758035025530
1961-01-01	0.809255325032755
1962-01-01	5.706486709880550
1963-01-01	8.743692450026160
1964-01-01	6.979250994662550
1965-01-01	13.214135256145800
1966-01-01	6.240359155684240
1967-01-01	6.391642089638020
1968-01-01	4.954360591921110
1969-01-01	2.160340150920950
1970-01-01	5.731155839814400
1971-01-01	8.236880629884630
1972-01-01	8.272287728425050
1973-01-01	11.416709262522900
1974-01-01	15.680378316024600
1975-01-01	16.953282433427700
1976-01-01	17.624875606664000
1977-01-01	24.538063396986100
1978-01-01	19.773683213224900
1979-01-01	15.660226682606400
1980-01-01	15.561894902376900
1981-01-01	14.549358677499700
1982-01-01	14.414995819774000
1983-01-01	12.174083518013400
1984-01-01	11.280263666649300
1985-01-01	8.814454808817520
1986-01-01	8.794939746882210
1987-01-01	5.248021766946590
1988-01-01	4.837264699220250
1989-01-01	6.791437533120850
1990-01-01	6.721825301136320
1991-01-01	5.934211113188320
1992-01-01	5.924534287341860
1993-01-01	4.569070884646550
1994-01-01	4.718413283820860
1995-01-01	4.673803185163570
1996-01-01	3.558840831172930
1997-01-01	1.971078904424600
1998-01-01	1.834329229054140
1999-01-01	2.310346949832780
2000-01-01	3.433516755474350
2001-01-01	3.589834948937230
2002-01-01	3.065765371866070
2003-01-01	3.039233684320950
2004-01-01	3.039201650149280
2005-01-01	3.368453987894230
2006-01-01	3.515374911259320
2007-01-01	2.787030473136320
2008-01-01	4.075660763682210
2009-01-01	-0.287996835001989
2010-01-01	1.799881330469410
2011-01-01	3.196146412241060
2012-01-01	2.446000185407080
2013-01-01	1.408546292417290
2014-01-01	-0.150870313497969
2015-01-01	-0.500461321406559
2016-01-01	-0.202671740806371
2017-01-01	1.956083333333340