Year	Ratio
1971-01-01	0.989520013332367
1972-01-01	0.992460012435913
1973-01-01	0.991379976272583
1974-01-01	0.993629992008209
1975-01-01	0.987810015678406
1976-01-01	0.999270021915436
1977-01-01	0.997619986534119
1978-01-01	0.998709976673126
1979-01-01	0.999509990215302
1980-01-01	1.000139951705930
1981-01-01	1.001839995384220
1982-01-01	0.984660029411316
1983-01-01	0.975679993629456
1984-01-01	0.973950028419495
1985-01-01	0.975899994373322
1986-01-01	0.977980017662048
1987-01-01	0.980579972267151
1988-01-01	0.981140017509460
1989-01-01	0.969359993934631
1990-01-01	0.992139995098114
1991-01-01	0.984279990196228
1992-01-01	0.985199987888336
1993-01-01	0.986270010471344
1994-01-01	0.985279977321625
1995-01-01	0.986339986324310
1996-01-01	0.985920011997223
1998-01-01	0.999100029468536
1999-01-01	1.001420021057130
2000-01-01	1.001579999923710
2004-01-01	0.991050004959106
2005-01-01	0.991590023040771
2006-01-01	0.992799997329712
2007-01-01	0.995199978351593
2008-01-01	0.998099982738495
2009-01-01	1.001360058784480
2010-01-01	1.004979968070980
2011-01-01	1.006839990615840
2012-01-01	1.010390043258670
2013-01-01	1.010810017585750
2014-01-01	1.011719942092900
2015-01-01	1.007889986038210
2016-01-01	1.000740051269530