2008-12-10   6.090
2009-01-25   6.640
2009-11-06   6.930
2009-11-20   6.350
2010-03-31   6.610
2010-12-14   6.490
2012-01-11   6.400
2012-11-20   6.450
2013-02-17   6.480
2013-03-06   6.150
2013-03-14   6.150
2013-11-28   5.990
2014-12-31   6.100
2015-01-11   6.360
2015-12-01   6.210
2016-02-10   6.310
2017-02-13   6.150