7 instances from 1 year 2017 - 7 instances Jan 6 Feb Mar Apr May Jun 21 4 Jun 21, 2017 4 instances 01:23:40 01:25:59 01:32:47 01:34:51 Jul Aug Sep Oct 2 2 Oct 2, 2017 2 instances 01:22:50 01:47:49 Nov Dec