2008-12-20   6.890
2009-01-10   6.920
2009-07-11   6.810
2009-08-02   7.030
2009-09-13   6.570
2009-10-08   6.840
2009-11-07   6.840
2009-11-21   6.830
2009-12-06   6.850
2010-02-10   6.560
2010-09-30   6.720
2010-12-08   6.980
2011-11-16   6.660
2012-01-15   6.600
2012-08-26   6.900
2012-11-18   6.790
2013-01-03   7.020
2013-01-05   6.810