Year	Ratio
1970-01-01	0.82116
1971-01-01	0.82178
1972-01-01	0.82374
1973-01-01	0.85179
1974-01-01	0.87603
1975-01-01	0.90865
1976-01-01	0.93609
1977-01-01	0.96252
1978-01-01	0.99016
1979-01-01	0.99208
1980-01-01	0.99958
1981-01-01	1.00962
1982-01-01	1.00477
1983-01-01	1.00855
1984-01-01	1.00756
1985-01-01	1.00761
1986-01-01	1.01347
1987-01-01	1.01540
1988-01-01	1.01225
1989-01-01	1.00929
1990-01-01	1.00874
1991-01-01	1.01448
1992-01-01	1.01422
1993-01-01	1.01013
1994-01-01	1.00309
1995-01-01	1.01076
1996-01-01	1.00959
1997-01-01	1.01314
1998-01-01	1.01898
1999-01-01	1.01478
2000-01-01	1.01003
2001-01-01	1.01074
2002-01-01	1.00182
2003-01-01	1.00491
2004-01-01	1.00865
2005-01-01	1.00634
2006-01-01	0.99921
2007-01-01	1.00180
2008-01-01	0.99769
2009-01-01	0.99965
2010-01-01	0.99737
2011-01-01	0.99488
2012-01-01	0.99381
2013-01-01	0.99882