Year	Percent
1960-01-01	2.857142857142860
1961-01-01	1.709401709401740
1962-01-01	2.100840336134410
1963-01-01	2.057613168724270
1964-01-01	4.233870967741950
1965-01-01	1.934235976789130
1966-01-01	4.743833017077840
1967-01-01	10.688405797101500
1968-01-01	0.163666121112915
1969-01-01	11.274509803922000
1970-01-01	2.588042587972890
1971-01-01	0.215551652643485
1972-01-01	3.234286624885930
1973-01-01	12.940813334093700
1974-01-01	16.876195682109600
1975-01-01	8.447328422746570
1976-01-01	10.069538030279500
1977-01-01	9.731132768537370
1978-01-01	8.823529411796690
1979-01-01	14.842308165532800
1980-01-01	14.109706449691800
1981-01-01	8.793969849246030
1982-01-01	7.276408617798570
1983-01-01	4.411808074552700
1984-01-01	3.688744527609080
1985-01-01	10.865952984119300
1986-01-01	18.687960687960400
1987-01-01	53.392953256324300
1988-01-01	7.313287808038120
1989-01-01	0.769646742206030
1990-01-01	21.739944339752600
1991-01-01	25.967462506022200
1992-01-01	43.666178385417100
1993-01-01	143.511558483490000
1994-01-01	368.478068706267000
1995-01-01	235.558815073605000
1996-01-01	-0.701887251452844
1997-01-01	7.145111608839330
1998-01-01	18.975369199447800
1999-01-01	98.773091411216400
2000-01-01	59.401686545078900
2001-01-01	38.586287887261100
2002-01-01	15.527398918570200
2003-01-01	23.002232177821900
2004-01-01	9.986325119748780
2005-01-01	9.898004895614640
2006-01-01	11.281304327397500
2007-01-01	6.426279344705200
2008-01-01	14.667142743791000
2009-01-01	-0.162987836502084
2010-01-01	6.944787295317720
2011-01-01	17.711779641455700
2012-01-01	5.006863193672800
2013-01-01	1.923436041083090
2014-01-01	3.383412727494810
2015-01-01	6.867599243856350
2016-01-01	55.484437751004000
2017-01-01	22.019533457099100