Year	Percent
1960-01-01	0.827300930713939
1961-01-01	-0.615384615384914
1962-01-01	0.103199174406296
1963-01-01	1.958762886598540
1964-01-01	-0.303336704752627
1965-01-01	0.202839756594436
1966-01-01	0.506072874498944
1967-01-01	0.704934542806568
1968-01-01	3.766666666166930
1969-01-01	2.385159010130330
1970-01-01	2.400188250316870
1971-01-01	4.144006128254590
1972-01-01	4.832303618656480
1973-01-01	7.808882340522570
1974-01-01	16.176666666500100
1975-01-01	4.639485840465400
1976-01-01	3.854389721627340
1977-01-01	7.326460481013280
1978-01-01	7.436283298946550
1979-01-01	9.463708295190170
1980-01-01	13.517560577258400
1981-01-01	10.744693608397600
1982-01-01	6.432797266936910
1983-01-01	5.049714241008780
1984-01-01	5.991951110484450
1985-01-01	5.034453663647980
1986-01-01	1.218369259676630
1987-01-01	2.791666666666970
1988-01-01	3.429266315362830
1989-01-01	3.765480482833920
1990-01-01	4.502054628958420
1991-01-01	5.035274388481060
1992-01-01	6.510219530658160
1993-01-01	4.854166666666960
1994-01-01	4.698589310549790
1995-01-01	2.615817879563370
1996-01-01	2.978924864812670
1997-01-01	3.605344443646270
1998-01-01	2.227707326543150
1999-01-01	1.630000000000000
2000-01-01	4.141657647020580
2001-01-01	1.977056382719020
2002-01-01	2.801155051807210
2003-01-01	4.139065386868580
2004-01-01	2.286217068016770
2005-01-01	2.558451985716980
2006-01-01	2.495874931248920
2007-01-01	2.372492743489450
2008-01-01	4.669171081160500
2009-01-01	0.374079975718624
2010-01-01	2.381258362752600
2011-01-01	3.289753748982280
2012-01-01	2.388752401082460
2013-01-01	-0.399357676464408
2014-01-01	-1.354988854463150
2015-01-01	-2.096997690531160
2016-01-01	-1.687890722770780
2017-01-01	0.531766496174534