Year	Ratio
2001-01-01	0.813279986381531
2002-01-01	0.961149990558624
2003-01-01	0.916260004043579
2004-01-01	0.925209999084473
2005-01-01	0.929769992828369
2006-01-01	0.956239998340607
2007-01-01	0.913940012454987
2008-01-01	0.900009989738464
2009-01-01	0.868229985237122
2010-01-01	0.867179989814758
2011-01-01	0.916329979896545
2012-01-01	0.912989974021912
2013-01-01	0.944679975509644
2015-01-01	0.987150013446808