Year	Ratio
1971-01-01	0.869610011577606
1972-01-01	0.962769985198975
1973-01-01	0.999170005321503
1974-01-01	0.978420019149780
1975-01-01	1.027729988098140
1976-01-01	0.977180004119873
1977-01-01	0.968739986419678
1978-01-01	0.963469982147217
1979-01-01	0.957249999046326
1980-01-01	0.942279994487762
1981-01-01	0.973649978637695
1982-01-01	0.917819976806641
1983-01-01	0.936689972877502
1984-01-01	0.957549989223480
1985-01-01	0.982789993286133
1986-01-01	0.968970000743866
1987-01-01	0.968119978904724
1988-01-01	0.962170004844666
1989-01-01	0.950540006160736
1990-01-01	0.936699986457825
1991-01-01	0.943830013275146
1992-01-01	0.946259975433350
1993-01-01	0.976920008659363
1994-01-01	0.978910028934479
1995-01-01	0.996379971504211
1996-01-01	1.032220005989070
1997-01-01	1.026299953460690
1998-01-01	0.926670014858246
1999-01-01	0.985360026359558
2000-01-01	1.002310037612920
2001-01-01	1.028059959411620
2002-01-01	0.949509978294373
2003-01-01	0.927860021591187
2004-01-01	0.925000011920929
2005-01-01	0.968240022659302
2006-01-01	1.057549953460690
2007-01-01	0.988219976425171
2008-01-01	0.998870015144348
2009-01-01	1.013010025024410
2010-01-01	1.011240005493160
2011-01-01	0.987389981746674
2012-01-01	1.031720042228700
2013-01-01	1.047760009765630
2014-01-01	1.028190016746520
2015-01-01	1.011409997940060
2016-01-01	0.993969976902008