Year	Ratio
1970-01-01	0.99687
1971-01-01	0.99753
1972-01-01	0.99949
1973-01-01	1.00268
1974-01-01	1.00096
1975-01-01	1.00372
1976-01-01	1.00274
1977-01-01	1.00483
1978-01-01	1.00376
1979-01-01	1.00408
1980-01-01	1.00419
1981-01-01	1.00664
1982-01-01	1.00945
1983-01-01	1.00953
1984-01-01	1.01001
1985-01-01	1.01105
1986-01-01	1.01244
1987-01-01	1.02535
1988-01-01	1.02600
1989-01-01	1.00222
1990-01-01	0.99862
1991-01-01	1.00968
1992-01-01	1.02168
1993-01-01	1.01424
1994-01-01	1.01746
1995-01-01	1.02411
1996-01-01	1.02000
1997-01-01	1.01392
1998-01-01	1.01471
1999-01-01	1.01104
2000-01-01	1.00449
2001-01-01	1.00193
2002-01-01	0.99815
2003-01-01	0.99291
2004-01-01	1.00821
2005-01-01	1.00171
2006-01-01	0.99831
2007-01-01	0.99758
2008-01-01	0.99852
2009-01-01	0.99948
2010-01-01	0.99565
2011-01-01	0.99076
2012-01-01	0.99012
2013-01-01	0.98387
2014-01-01	0.98542
2015-01-01	0.98861
2016-01-01	0.98907