Year	Ratio
1993-01-01	0.982150018215179
1994-01-01	0.985339999198914
1995-01-01	0.985509991645813
1996-01-01	0.983060002326965
1997-01-01	0.984080016613007
1998-01-01	0.976949989795685
1999-01-01	0.975600004196167
2000-01-01	0.967599987983704
2001-01-01	0.968540012836456
2002-01-01	0.970879971981049
2003-01-01	0.973089993000031
2004-01-01	0.969910025596619
2005-01-01	0.968840003013611
2007-01-01	0.960749983787537
2008-01-01	0.950810015201569
2009-01-01	0.959079980850220
2010-01-01	0.971629977226257
2012-01-01	0.980579972267151
2013-01-01	0.972019970417023
2014-01-01	0.970239996910095
2015-01-01	0.983389973640442