Year	Percent
1960-01-01	1.4388048897423700
1961-01-01	1.8453898853189000
1962-01-01	4.3159988652385000
1963-01-01	3.4402120182040100
1964-01-01	3.0805539237269400
1965-01-01	3.4144809246381200
1966-01-01	4.7759844413122400
1967-01-01	4.0051926996913700
1968-01-01	2.3958274691613200
1969-01-01	2.4890258976268100
1970-01-01	3.6159883214874600
1971-01-01	6.5732260463495700
1972-01-01	6.6600013259052100
1973-01-01	8.7546762244687400
1974-01-01	9.7674136006038200
1975-01-01	6.6965954074892200
1976-01-01	1.7154773660740600
1977-01-01	1.2959975108187000
1978-01-01	1.0287915296177600
1979-01-01	3.6476419133478700
1980-01-01	4.0224986950801000
1981-01-01	6.4903077418343100
1982-01-01	5.6551026431637400
1983-01-01	2.9498326756406100
1984-01-01	2.9314359969332400
1985-01-01	3.4353898690449700
1986-01-01	0.7503088698972790
1987-01-01	1.4403284235524500
1988-01-01	1.8724591724840000
1989-01-01	3.1552891002532600
1990-01-01	5.4039539823505700
1991-01-01	5.8595859353956900
1992-01-01	4.0370091638241100
1993-01-01	3.2926294832761100
1994-01-01	0.8521415222199410
1995-01-01	1.7997995625423800
1996-01-01	0.8116580382348190
1997-01-01	0.5202146423565250
1998-01-01	0.0179488591812253
1999-01-01	0.8064468570954730
2000-01-01	1.5585184678516300
2001-01-01	0.9890171534033500
2002-01-01	0.6427084419256240
2003-01-01	0.6382989112115010
2004-01-01	0.8028826181297910
2005-01-01	1.1719511444650200
2006-01-01	1.0595250554908300
2007-01-01	0.7323366312397350
2008-01-01	2.4260480402858700
2009-01-01	-0.4804679339878690
2010-01-01	0.6882334487334070
2011-01-01	0.2313365769130370
2012-01-01	-0.6925458419303710
2013-01-01	-0.2173085176476200
2014-01-01	-0.0132291602454955
2015-01-01	-1.1439006443764500
2016-01-01	-0.4346076385429480
2017-01-01	0.5337959881327590