Year	Ratio
1992-01-01	1.011669993400570
1993-01-01	0.994480013847351
1994-01-01	0.994000017642975
1995-01-01	0.993570029735565
1996-01-01	0.991580009460449
1997-01-01	0.990769982337952
1998-01-01	0.989560008049011
1999-01-01	0.990540027618408
2000-01-01	0.991810023784637
2001-01-01	0.992680013179779
2002-01-01	0.992760002613068
2003-01-01	0.994920015335083
2004-01-01	0.995790004730225
2005-01-01	0.998160004615784
2006-01-01	0.997590005397797
2007-01-01	0.996819972991943
2008-01-01	0.995169997215271
2009-01-01	0.996190011501312
2010-01-01	0.996959984302521
2011-01-01	0.996249973773956
2012-01-01	0.998300015926361
2013-01-01	0.993430018424988
2014-01-01	0.993650019168854
2015-01-01	0.994499981403351