2008-04-29   5.750
2008-06-13   6.150
2009-11-06   5.750
2010-04-01   5.780
2010-06-01   5.580
2010-09-30   5.860
2011-03-26   5.790
2011-10-09   5.850
2012-09-21   5.890
2014-05-28   5.580
2014-07-22   5.980
2014-09-22   5.860
2015-06-25   5.830
2015-07-25   5.760
2015-08-24   6.020
2016-07-23   6.020