2008-03-31   4.260
2008-04-28   4.280
2009-04-21   4.280
2009-05-06   3.890
2010-04-01   4.990
2010-09-30   4.630
2011-03-26   3.130
2013-03-13   5.260
2014-03-17   5.200
2014-05-28   4.920
2014-09-22   4.790
2015-06-25   4.550
2015-07-25   4.280
2017-02-13   4.050
2017-05-20   3.990