2008-12-08   19.690
2008-12-09   19.720
2008-12-10   19.770
2009-01-24   19.740
2009-05-20   19.560
2010-04-01   19.790
2010-06-11   19.780
2010-12-14   19.640
2012-04-05   19.700
2013-03-14   19.790
2013-11-14   19.780
2014-04-22   19.720
2014-04-23   19.730
2015-04-05   19.830
2015-04-15   19.810
2016-03-17   19.700
2017-02-10   20.080