2008-06-12   4.800
2008-07-30   4.680
2009-05-06   4.510
2010-06-12   4.600
2011-03-27   4.590
2012-06-13   4.560
2013-07-19   4.560
2014-07-21   4.600
2014-09-23   4.520
2015-05-25   4.550