2008-03-31   26.030
2008-04-29   31.520
2009-11-06   25.630
2010-02-11   25.700
2010-04-01   32.150
2010-05-31   25.830
2010-12-08   31.390
2012-01-16   31.140
2012-04-20   32.230
2013-03-13   30.980
2013-06-16   25.710
2015-01-14   26.200
2015-11-30   29.920
2017-02-10   29.770