2008-04-29   3.820
2008-06-13   3.400
2009-11-07   3.060
2010-04-01   3.610
2010-06-01   3.170
2010-09-30   4.180
2011-03-26   3.260
2011-10-09   3.240
2012-09-21   4.270
2014-03-20   4.300
2014-05-28   4.350
2014-07-22   4.130
2014-09-22   4.150
2015-06-25   3.860
2015-07-25   3.920
2015-08-24   3.850
2016-07-23   3.750