2008-03-31   -3.894
2008-04-28   -4.198
2009-04-21   -3.929
2009-05-06   -4.014
2010-04-01   -3.859
2010-09-30   -4.149
2011-03-26   -3.965
2013-03-13   -4.059
2014-03-17   -4.308
2014-05-28   -4.068
2014-09-22   -3.954
2015-06-25   -4.127
2015-07-25   -4.188
2017-02-13   -4.023
2017-05-20   -3.907