2008-03-31   25.750
2008-04-29   31.490
2009-11-06   25.720
2010-02-11   25.640
2010-04-01   31.510
2010-05-31   25.730
2010-12-08   31.250
2012-01-16   31.540
2012-04-20   31.900
2013-01-03   25.520
2013-03-13   25.560
2013-06-16   25.860
2015-01-14   25.890
2015-11-30   25.760
2017-02-10   29.940