2009-01-10   7.850
2009-10-09   6.510
2009-11-07   7.220
2009-12-06   6.980
2010-02-11   7.020
2010-09-30   8.380
2010-12-08   8.760
2011-08-05   7.220
2012-01-15   6.720
2013-01-03   7.850
2013-01-05   7.710
2014-04-21   7.860
2014-08-22   7.750
2015-01-02   8.050
2016-09-25   7.370
2017-02-13   6.950