Year	Ratio
1970-01-01	1.00018
1971-01-01	1.00089
1972-01-01	1.00274
1973-01-01	1.01565
1974-01-01	0.99927
1975-01-01	0.99991
1976-01-01	1.01529
1977-01-01	0.99709
1978-01-01	0.99730
1979-01-01	0.99401
1980-01-01	0.99669
1981-01-01	0.99660
1982-01-01	0.99713
1983-01-01	0.99706
1984-01-01	0.99664
1985-01-01	0.99322
1986-01-01	0.99207
1987-01-01	0.99479
1988-01-01	0.99000
1989-01-01	0.99258
1990-01-01	0.99521
1991-01-01	0.99630
1992-01-01	0.99554
1993-01-01	0.99604
1994-01-01	0.99283
1995-01-01	0.98686
1996-01-01	0.98678
1997-01-01	0.98964
1998-01-01	0.98836
1999-01-01	0.98875
2000-01-01	0.99081
2001-01-01	0.99105
2002-01-01	0.98787
2003-01-01	0.98844
2004-01-01	0.98924
2005-01-01	0.98780
2006-01-01	0.98719
2007-01-01	0.98777
2008-01-01	0.98790
2009-01-01	0.99037
2010-01-01	0.99183
2011-01-01	0.99356
2012-01-01	0.99511
2013-01-01	0.99632
2014-01-01	0.99649
2015-01-01	0.99698
2016-01-01	0.99761