2009-01-10   3.620
2009-10-09   3.540
2009-11-07   3.500
2009-12-06   3.510
2010-02-11   3.800
2010-09-30   3.800
2010-12-08   3.680
2011-08-05   3.660
2012-01-15   3.620
2013-01-03   3.850
2013-01-05   3.890
2014-04-21   3.900
2014-08-22   3.610
2015-01-02   3.600
2016-09-25   3.770
2017-02-13   3.490