2008-12-10   20.790
2009-01-25   20.880
2009-11-06   22.060
2009-11-20   22.060
2010-02-17   22.550
2010-03-31   18.670
2010-12-14   21.180
2012-01-11   19.560
2013-02-17   21.820
2013-03-06   19.240
2013-03-14   21.590
2013-11-28   18.440
2014-12-31   18.890
2015-01-11   20.720
2015-12-01   21.320
2016-02-10   18.830
2017-02-13   19.010