Year	Ratio
1971-01-01	0.851189970970154
1972-01-01	0.860700011253357
1973-01-01	0.879459977149963
1974-01-01	0.903479993343353
1975-01-01	0.929679989814758
1976-01-01	0.930490016937256
1977-01-01	0.931159973144531
1978-01-01	0.935949981212616
1979-01-01	1.024430036544800
1980-01-01	0.987479984760284
1981-01-01	0.998520016670227
1982-01-01	0.999979972839355
1983-01-01	1.037150025367740
1984-01-01	1.032410025596620
1985-01-01	1.021999955177310
1986-01-01	1.038920044898990
1987-01-01	1.039579987525940
1988-01-01	1.043149948120120
1993-01-01	1.019729971885680
1996-01-01	1.045130014419560
1998-01-01	1.041610002517700
1999-01-01	1.026649951934810
2000-01-01	1.016739964485170
2001-01-01	1.020740032196040
2002-01-01	1.006989955902100
2003-01-01	1.017199993133540
2004-01-01	1.002580046653750
2005-01-01	1.010879993438720
2006-01-01	1.015730023384090
2007-01-01	1.012549996376040
2010-01-01	1.050999999046330
2011-01-01	1.042549967765810
2012-01-01	1.042299985885620
2013-01-01	1.046460032463070
2014-01-01	1.040380001068120
2015-01-01	1.039019942283630
2016-01-01	1.036700010299680
2017-01-01	1.029010057449340