Year	Ratio
2003-01-01	0.380970001220703
2004-01-01	0.370900005102158
2006-01-01	0.434439986944199
2007-01-01	0.467990010976791
2008-01-01	0.516629993915558
2009-01-01	0.493380010128021
2010-01-01	0.616930007934570
2011-01-01	0.531679987907410
2012-01-01	0.553080022335052
2014-01-01	0.475100010633469
2015-01-01	0.488099992275238
2016-01-01	0.546019971370697