2008-03-31   3.740
2008-04-29   2.750
2009-11-06   3.260
2010-02-11   3.310
2010-04-01   2.760
2010-05-31   3.940
2010-12-08   3.180
2012-01-16   2.310
2012-04-20   3.230
2013-03-13   3.020
2013-06-16   3.960
2015-01-14   3.650
2015-11-30   3.210
2017-02-10   2.730