Year	Ratio
1970-01-01	0.95868
1971-01-01	0.95927
1972-01-01	0.96124
1973-01-01	0.96821
1974-01-01	0.96448
1975-01-01	0.97930
1976-01-01	0.98302
1977-01-01	0.98813
1978-01-01	0.99346
1979-01-01	0.99534
1980-01-01	1.00201
1981-01-01	1.01430
1982-01-01	1.00716
1983-01-01	1.01488
1984-01-01	1.01343
1985-01-01	1.01523
1986-01-01	1.01877
1987-01-01	1.01967
1988-01-01	1.01836
1989-01-01	1.01234
1990-01-01	1.01140
1991-01-01	1.01575
1992-01-01	1.02029
1993-01-01	1.01438
1994-01-01	1.00819
1995-01-01	1.01097
1996-01-01	1.01366
1997-01-01	1.01031
1998-01-01	1.01208
1999-01-01	1.01218
2000-01-01	1.00951
2001-01-01	1.01065
2002-01-01	1.00826
2003-01-01	1.00927
2004-01-01	1.01008
2005-01-01	1.00766
2006-01-01	1.00570
2007-01-01	1.00451
2008-01-01	1.00357
2009-01-01	0.99752
2010-01-01	0.99434
2011-01-01	0.99227
2012-01-01	0.99044
2013-01-01	1.00161
2014-01-01	1.00162
2015-01-01	1.00018
2016-01-01	1.00122