Year	Percent
1960-01-01	2.228112420670830
1961-01-01	6.789823404402430
1962-01-01	9.408194068265560
1963-01-01	6.581137364640580
1964-01-01	5.172750423288170
1965-01-01	7.708333264204980
1966-01-01	7.930367544484480
1967-01-01	1.706093160059380
1968-01-01	2.079221858136220
1969-01-01	2.458054256177990
1970-01-01	6.110742035987380
1971-01-01	11.972570922966300
1972-01-01	12.881467716976100
1973-01-01	20.032367164509700
1974-01-01	39.679977097286000
1975-01-01	39.306734224561200
1976-01-01	31.310865267313500
1977-01-01	34.616716871162500
1978-01-01	50.550938232593200
1979-01-01	78.310024532916700
1980-01-01	131.024998340780000
1981-01-01	116.800011462711000
1982-01-01	120.364381812063000
1983-01-01	145.951515575109000
1984-01-01	373.215652132421000
1985-01-01	304.584147213124000
1986-01-01	48.133342845602500
1987-01-01	19.852613484433700
1988-01-01	16.258329323326900
1989-01-01	20.249449383237900
1990-01-01	17.173344373784700
1991-01-01	19.005946336284700
1992-01-01	11.948019765766200
1993-01-01	10.943942218746200
1994-01-01	12.350000912015000
1995-01-01	10.043018816847600
1996-01-01	11.276626074070400
1997-01-01	9.001151357101090
1998-01-01	5.434842778198670
1999-01-01	5.200000293362160
2000-01-01	1.124838234124540
2001-01-01	1.099999254792720
2002-01-01	5.687440026806580
2003-01-01	0.716666277155599
2004-01-01	-0.413701746023948
2005-01-01	1.329347357561190
2006-01-01	2.107249088822520
2007-01-01	0.491664700233525
2008-01-01	4.594076805883860
2009-01-01	3.325001415412020
2010-01-01	2.693766947864550
2011-01-01	3.458334985077660
2012-01-01	1.707614720498860
2013-01-01	1.549995739034650
2014-01-01	0.475954281452880
2015-01-01	-0.600006527400082
2016-01-01	-0.544937550051134
2017-01-01	0.242241245108701