2008-03-31   3.968
2008-04-28   3.501
2009-04-21   4.051
2009-05-06   4.166
2010-04-01   3.800
2010-09-30   3.802
2011-03-26   3.229
2013-03-13   3.851
2014-03-17   3.814
2014-05-28   3.893
2014-09-22   4.052
2015-06-24   3.498
2015-07-24   3.917
2017-02-13   3.949
2017-05-20   3.529