2008-03-31   8.440
2008-04-28   8.370
2009-04-21   9.000
2009-05-06   8.330
2010-04-01   7.710
2010-09-30   7.880
2011-03-26   7.240
2013-03-13   7.540
2014-03-17   8.320
2014-05-28   8.440
2014-09-22   8.010
2015-06-24   7.780
2015-07-24   7.730
2017-02-13   7.950
2017-05-20   8.310