2008-03-31   20.930
2008-04-29   20.880
2009-11-06   20.820
2010-02-11   20.780
2010-04-01   20.820
2010-05-31   20.620
2010-12-08   20.440
2012-01-16   20.810
2012-04-20   20.490
2013-01-03   20.410
2013-03-13   20.630
2013-06-16   20.780
2015-01-14   20.810
2015-11-30   20.500
2017-02-10   20.920