Year	Percent
1966-01-01	2.47900839657731000
1967-01-01	3.20717908718530000
1968-01-01	3.96945410534388000
1969-01-01	2.25438149968916000
1970-01-01	13.39876253481820000
1971-01-01	8.39134524920583000
1972-01-01	7.88057628905349000
1973-01-01	13.44060069717410000
1974-01-01	34.22060422687920000
1975-01-01	17.74278769965230000
1976-01-01	9.66911984668740000
1977-01-01	8.86573190026191000
1978-01-01	10.87751829209910000
1979-01-01	9.39004271287360000
1980-01-01	19.47772911329120000
1981-01-01	15.12484437703460000
1982-01-01	4.61406749873086000
1983-01-01	1.47305853462303000
1984-01-01	1.20548410365589000
1985-01-01	1.42319898238732000
1986-01-01	2.19025825433131000
1987-01-01	7.02175303902782000
1988-01-01	0.82947242564639200
1989-01-01	4.37263766397329000
1990-01-01	4.26755662855972000
1991-01-01	6.14955053119051000
1992-01-01	5.13889779944826000
1993-01-01	0.84818159628960600
1994-01-01	2.81591665153970000
1995-01-01	5.62965921512375000
1996-01-01	0.92484260961599200
1997-01-01	-0.00552028705472678
1998-01-01	3.20194341679090000
1999-01-01	3.50379784108943000
2000-01-01	3.71078608713611000
2001-01-01	5.30722081028545000
2002-01-01	-0.25553662691644200
2003-01-01	1.03425372426237000
2004-01-01	1.46036814425232000
2005-01-01	3.91076965798121000
2006-01-01	2.33832175307319000
2007-01-01	2.82310373736930000
2008-01-01	5.54954769383937000
2009-01-01	-0.15693608716865700
2010-01-01	3.25034409180126000
2011-01-01	2.76940794144093000
2012-01-01	4.17763587102517000
2013-01-01	1.47201838917869000
2014-01-01	3.51847818195019000
2015-01-01	-0.98430920351251700
2016-01-01	-3.09298958876075000
2017-01-01	0.11841772577107600