Year	Percent
1960-01-01	4.927518869031130
1961-01-01	1.608759690819300
1962-01-01	1.198984178150790
1963-01-01	0.594055008461962
1964-01-01	2.337903172343620
1965-01-01	3.568038657429360
1966-01-01	4.215788377384380
1967-01-01	3.016948475021480
1968-01-01	2.333950934670240
1969-01-01	3.367003367116830
1970-01-01	5.003395079618760
1971-01-01	5.469026574619600
1972-01-01	4.943681258175470
1973-01-01	12.081952399428100
1974-01-01	23.784020504773400
1975-01-01	14.944524278520600
1976-01-01	15.824725530059200
1977-01-01	29.064125026772900
1978-01-01	17.457296225332500
1979-01-01	18.191251892100600
1980-01-01	26.351645685261800
1981-01-01	27.933745928742200
1982-01-01	58.913430586612800
1983-01-01	101.874946175111000
1984-01-01	65.448810586127200
1985-01-01	57.748449795318000
1986-01-01	86.233312752031800
1987-01-01	131.827394113751000
1988-01-01	114.162240644183000
1989-01-01	20.007881871270400
1990-01-01	26.651684758059200
1991-01-01	22.662359942648900
1992-01-01	15.507886766725500
1993-01-01	9.751458238937330
1994-01-01	6.965818609795420
1995-01-01	34.999258226995500
1996-01-01	34.378392955428800
1997-01-01	20.625628924719300
1998-01-01	15.928390533417700
1999-01-01	16.585619669794300
2000-01-01	9.491559191175290
2001-01-01	6.367736575766170
2002-01-01	5.030731124213990
2003-01-01	4.546899236424250
2004-01-01	4.688405103702650
2005-01-01	3.988059423417100
2006-01-01	3.629467862742150
2007-01-01	3.966846723965300
2008-01-01	5.124980320713440
2009-01-01	5.297358882877260
2010-01-01	4.156730933189630
2011-01-01	3.407376942518750
2012-01-01	4.111508545574090
2013-01-01	3.806389823432600
2014-01-01	4.018617201909970
2015-01-01	2.720641262570040
2016-01-01	2.821707751697150
2017-01-01	6.041455823035140