2008-03-31   19.650
2008-04-29   19.630
2009-11-06   19.660
2010-02-11   19.660
2010-04-01   19.570
2010-05-30   19.630
2010-12-08   19.650
2012-01-16   19.630
2012-04-20   19.580
2013-01-03   19.610
2013-03-13   19.570
2013-06-16   19.650
2015-01-14   19.680
2015-11-30   19.530
2017-02-10   19.800