Year	Ratio
2007-01-01	1.59941005706787
2008-01-01	1.55693995952606
2009-01-01	1.55736994743347
2010-01-01	1.47739005088806
2011-01-01	1.45079994201660
2012-01-01	1.43417000770569
2013-01-01	1.42727994918823
2014-01-01	1.41003000736237
2015-01-01	1.40657997131348