Year	Ratio
1970-01-01	0.96560
1971-01-01	0.96381
1972-01-01	0.96232
1973-01-01	0.97297
1974-01-01	0.97964
1975-01-01	1.00212
1976-01-01	1.00973
1977-01-01	1.00063
1978-01-01	1.00131
1979-01-01	1.00372
1980-01-01	1.01707
1981-01-01	1.01040
1982-01-01	1.00452
1983-01-01	0.99847
1984-01-01	0.99092
1985-01-01	0.99673
1986-01-01	1.00703
1987-01-01	1.00376
1988-01-01	1.00983
1989-01-01	1.01974
1990-01-01	1.01967
1991-01-01	1.01889
1992-01-01	1.02313
1993-01-01	1.02073
1994-01-01	1.02471
1995-01-01	1.01710
1996-01-01	1.02176
1997-01-01	1.01914
1998-01-01	1.01487
1999-01-01	1.00595
2000-01-01	1.00776
2001-01-01	1.00375
2002-01-01	1.00986
2003-01-01	1.00602
2004-01-01	0.99700
2005-01-01	1.00119
2006-01-01	1.01253
2007-01-01	1.01673
2008-01-01	1.02450
2009-01-01	1.02370
2010-01-01	1.02703
2011-01-01	1.02325
2012-01-01	1.03492
2013-01-01	1.03701
2014-01-01	1.03733
2015-01-01	1.03256
2016-01-01	1.02682