2009-11-06   -21.764
2009-11-20   -21.850
2010-03-31   -21.744
2010-12-14   -21.771
2012-01-13   -21.813
2013-11-28   -21.948
2014-08-22   -21.858
2014-12-31   -21.885
2015-12-01   -21.979
2017-02-13   -21.884