Year	Ratio
1993-01-01	0.99771
1994-01-01	1.00100
1995-01-01	1.00256
1996-01-01	1.00157
1997-01-01	1.00189
1998-01-01	0.99902
1999-01-01	0.99386
2000-01-01	0.99046
2001-01-01	0.98891
2002-01-01	0.98652
2003-01-01	0.98504
2004-01-01	0.98312
2005-01-01	0.98303
2006-01-01	0.97774
2007-01-01	0.97724
2008-01-01	0.97738
2009-01-01	0.97876
2010-01-01	0.97600
2011-01-01	0.97097
2012-01-01	0.97940
2013-01-01	0.98684