2008-03-31   20.870
2008-04-29   20.880
2009-11-06   20.730
2010-02-11   20.610
2010-04-01   20.800
2010-05-30   20.580
2010-12-08   20.640
2012-01-16   20.740
2012-04-20   20.720
2013-01-03   20.570
2013-03-13   20.690
2013-06-16   20.760
2014-04-12   20.800
2014-04-24   20.760
2015-01-14   20.730
2015-11-30   20.730
2017-02-10   20.660