Year	Percent
1960-01-01	6.947368421052880
1961-01-01	1.640419947506050
1962-01-01	-0.516462233698480
1963-01-01	1.456488447974980
1964-01-01	4.179586881453210
1965-01-01	5.568635479363730
1966-01-01	7.227621597877330
1967-01-01	6.811399634286910
1968-01-01	0.170627348438054
1969-01-01	3.186986795736910
1970-01-01	5.349840909830140
1971-01-01	4.730691482322740
1972-01-01	5.183237645491420
1973-01-01	23.070084025084400
1974-01-01	26.663034853748800
1975-01-01	20.904509457399800
1976-01-01	7.158323731184660
1977-01-01	10.132967687405400
1978-01-01	6.138692667427430
1979-01-01	8.267046976175690
1980-01-01	11.938230910708800
1981-01-01	11.879913592528300
1982-01-01	5.903528784358560
1983-01-01	6.362033499853000
1984-01-01	6.087166735737190
1985-01-01	5.614839217932220
1986-01-01	3.506414247582000
1987-01-01	4.681218546202170
1988-01-01	8.837937018177770
1989-01-01	7.844264737400410
1990-01-01	9.052131552797790
1991-01-01	11.791270335141600
1992-01-01	9.509041461901460
1993-01-01	9.973664760292100
1994-01-01	12.368194393694800
1995-01-01	12.343578517051300
1996-01-01	10.373808588500200
1997-01-01	11.375492886512200
1998-01-01	6.228004154245480
1999-01-01	4.142637180821680
2000-01-01	4.366664512916810
2001-01-01	3.148261445906160
2002-01-01	3.290344726131570
2003-01-01	2.914134700594770
2004-01-01	7.444624693427390
2005-01-01	9.063327370304190
2006-01-01	7.921084400587860
2007-01-01	7.598684410507770
2008-01-01	20.286121092955400
2009-01-01	13.647765063976100
2010-01-01	13.881139257771300
2011-01-01	11.916769465205700
2012-01-01	9.682351860556850
2013-01-01	7.692156118995660
2014-01-01	7.189384028470280
2015-01-01	2.529328172542260
2016-01-01	3.765119163565850
2017-01-01	4.085373680326000