2008-03-31   3.990
2008-04-28   3.880
2009-04-21   3.630
2009-05-06   3.410
2010-04-01   4.060
2010-09-30   4.280
2011-03-26   3.900
2013-03-13   4.120
2014-03-17   4.220
2014-05-28   4.260
2014-09-22   4.260
2015-06-25   4.390
2015-07-25   4.300
2017-02-13   4.150
2017-05-20   3.830