2009-01-10   6.450
2009-10-09   6.180
2009-11-07   6.730
2009-12-06   6.080
2010-02-11   6.960
2010-03-23   6.660
2010-09-30   7.040
2010-12-08   6.920
2011-08-05   6.120
2012-01-15   6.620
2013-01-03   7.020
2013-01-05   7.030
2013-11-29   6.820
2014-04-21   7.090
2014-08-22   6.520
2015-01-02   6.330
2015-11-30   6.700
2016-09-25   6.990
2017-02-13   5.860