Year	Ratio
2008-01-01	130.573900728312
2009-01-01	122.945029299016
2010-01-01	114.828135002148
2011-01-01	152.738795355610
2012-01-01	147.598515308720
2013-01-01	140.975004574674
2015-01-01	128.499069594737