2008-03-31   4.010
2008-04-28   4.510
2009-04-21   4.170
2009-05-06   3.690
2010-04-01   4.630
2010-09-30   4.570
2011-03-26   3.150
2013-03-13   5.180
2014-03-17   4.980
2014-05-28   4.820
2014-09-22   4.820
2015-06-25   4.470
2015-07-25   4.270
2017-02-13   4.120
2017-05-20   3.920