Year	Percent
1960-01-01	8.664459162719070
1961-01-01	5.916708988363780
1962-01-01	6.641093263597490
1963-01-01	6.070143884285930
1964-01-01	9.792284866634850
1965-01-01	16.389961389442400
1966-01-01	8.840603749222050
1967-01-01	9.783602560634150
1968-01-01	19.086618545438000
1969-01-01	6.236158060780620
1970-01-01	5.025235900724240
1971-01-01	6.790639364954160
1972-01-01	7.219722167705440
1973-01-01	9.489051095033970
1974-01-01	16.891666666570200
1975-01-01	23.618735296332600
1976-01-01	33.483275663456700
1977-01-01	38.054091419679300
1978-01-01	57.848782625150500
1979-01-01	66.694422966487700
1980-01-01	59.145071244491400
1981-01-01	75.433268757606400
1982-01-01	64.448158538792900
1983-01-01	111.150635209158000
1984-01-01	110.208519562543000
1985-01-01	163.399505243688000
1986-01-01	77.921025547359500
1987-01-01	85.822306238184600
1988-01-01	667.019328585961000
1989-01-01	3398.679010053320000
1990-01-01	7481.663611245260000
1991-01-01	409.530166622023000
1992-01-01	73.528294244264100
1993-01-01	48.579986446888400
1994-01-01	23.736905056504600
1995-01-01	11.128702970708800
1996-01-01	11.537942411517700
1997-01-01	8.562189489536540
1998-01-01	7.247821752134690
1999-01-01	3.469659962930210
2000-01-01	3.757338333444720
2001-01-01	1.977098785020540
2002-01-01	0.193135003853741
2003-01-01	2.259377533630730
2004-01-01	3.662473200922330
2005-01-01	1.616301938625430
2006-01-01	2.002258012488190
2007-01-01	1.779986446803720
2008-01-01	5.785875982067550
2009-01-01	2.936231535967010
2010-01-01	1.528320597329030
2011-01-01	3.370685024828670
2012-01-01	3.653732358953910
2013-01-01	2.816502820554190
2014-01-01	3.226046788854140
2015-01-01	3.555396246842280
2016-01-01	3.595722243486140
2017-01-01	2.803510545968300