2008-03-31   2.930
2008-04-28   2.860
2009-04-21   2.820
2009-05-06   2.410
2010-04-01   3.300
2010-09-30   3.110
2011-03-26   2.840
2013-03-13   3.310
2014-03-17   3.470
2014-09-22   3.210
2015-06-25   3.190
2015-07-25   3.340
2017-02-13   3.310
2017-05-20   3.010