Year	Ratio
1981-01-01	0.988349974155426
1986-01-01	0.999440014362335
1991-01-01	1.007500052452090
1992-01-01	1.009230017662050
1993-01-01	1.011209964752200
1994-01-01	0.943639993667603
1995-01-01	0.994719982147217
1996-01-01	1.019170045852660
1997-01-01	0.995209991931915
1998-01-01	1.006019949913020
1999-01-01	1.000900030136110
2000-01-01	0.993929982185364
2001-01-01	1.018409967422490
2002-01-01	1.016829967498780
2003-01-01	0.987959980964661
2004-01-01	0.963259994983673
2005-01-01	0.975629985332489
2006-01-01	1.017899990081790
2007-01-01	0.973039984703064
2008-01-01	0.986320018768311
2009-01-01	0.995280027389526
2010-01-01	1.007349967956540
2011-01-01	1.006170034408570
2012-01-01	0.991029977798462
2013-01-01	0.992049992084503
2014-01-01	0.993849992752075
2015-01-01	1.003749966621400
2016-01-01	1.004230022430420