2009-01-25   0.550
2009-11-06   0.450
2009-11-20   0.600
2010-03-31   0.590
2010-12-14   0.560
2012-01-13   0.530
2013-11-28   0.500
2014-08-22   0.380
2014-12-31   0.490
2015-12-01   0.510
2017-02-13   0.470