Year	Ratio
1971-01-01	1.002449989318850
1972-01-01	1.004169940948490
1973-01-01	1.085870027542110
1974-01-01	1.002650022506710
1975-01-01	1.000730037689210
1976-01-01	1.086640000343320
1977-01-01	0.989939987659454
1978-01-01	0.994769990444183
1979-01-01	0.984440028667450
1980-01-01	0.987469971179962
1981-01-01	0.986240029335022
1982-01-01	0.981350004673004
1983-01-01	0.984799981117249
1985-01-01	0.983200013637543
1986-01-01	0.978910028934479
1987-01-01	0.984459996223450
1988-01-01	0.987370014190674
1989-01-01	0.987380027770996
1990-01-01	0.982819974422455
1991-01-01	0.985740005970001
1992-01-01	0.984229981899261
1993-01-01	0.984690010547638
1994-01-01	0.979700028896332
1995-01-01	0.981660008430481
1996-01-01	0.984749972820282
1997-01-01	0.989820003509521
1998-01-01	0.989709973335266
1999-01-01	0.988629996776581
2000-01-01	0.989920020103455
2001-01-01	0.989859998226166
2002-01-01	0.991140007972717
2003-01-01	0.990509986877441
2004-01-01	0.992290019989014
2005-01-01	0.987519979476929
2006-01-01	0.986670017242432
2007-01-01	0.987389981746674
2008-01-01	0.986729979515076
2009-01-01	0.988669991493225
2010-01-01	0.988780021667480
2011-01-01	0.997319996356964
2012-01-01	1.000749945640560
2013-01-01	0.997510015964508
2014-01-01	0.997080028057098
2015-01-01	0.996699988842011