2008-06-12   3.620
2008-07-30   3.370
2009-05-06   3.340
2010-06-12   3.480
2011-03-27   3.390
2012-06-13   3.380
2013-07-19   3.330
2014-07-21   3.430
2014-09-23   3.260
2015-05-25   3.290