Year	Percent
1960-01-01	3.384615384615520
1961-01-01	2.511321531006940
1962-01-01	0.168674698957622
1963-01-01	1.876353139212690
1964-01-01	2.180243998596840
1965-01-01	1.602218456101320
1966-01-01	0.523123578699539
1967-01-01	0.693868315713028
1968-01-01	2.037300576822770
1969-01-01	2.334287601862220
1970-01-01	3.715658848092590
1971-01-01	2.323812158388100
1972-01-01	3.372761067811540
1973-01-01	7.689289917861470
1974-01-01	7.255616272040100
1975-01-01	8.791666666166900
1976-01-01	0.551512830258580
1977-01-01	10.040374800236400
1978-01-01	4.707511249514880
1979-01-01	7.147107437978910
1980-01-01	15.747254103486000
1981-01-01	11.509755837712300
1982-01-01	5.818233972186680
1983-01-01	-0.880997560317525
1984-01-01	-0.442500000750074
1985-01-01	-0.235207459677486
1986-01-01	2.027888714147630
1987-01-01	0.431725669422428
1988-01-01	0.938344387128529
1989-01-01	0.847691359226220
1990-01-01	2.983405860635590
1991-01-01	2.542192847869760
1992-01-01	1.633212098890450
1993-01-01	4.144819541804900
1994-01-01	4.129921816382570
1995-01-01	4.426645502866550
1996-01-01	2.054000000000080
1997-01-01	3.112077919532710
1998-01-01	2.385251354176630
1999-01-01	2.134768888063850
2000-01-01	2.369592875318110
2001-01-01	2.929492443241010
2002-01-01	2.188490480605480
2003-01-01	1.303837774426020
2004-01-01	2.790828480677530
2005-01-01	3.007966524503180
2006-01-01	2.773264170989310
2007-01-01	1.251349406261230
2008-01-01	4.256736945917860
2009-01-01	2.085357331560730
2010-01-01	1.516833766038280
2011-01-01	2.721905169152830
2012-01-01	2.417624643760600
2013-01-01	1.374906203101570
2014-01-01	0.311500057827987
2015-01-01	1.099931590557960
2016-01-01	0.638020508792792
2017-01-01	1.364354481507090