14 instances from 2 years 2017 - 2 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct Nov Dec 2016 - 12 instances Jan Feb Mar Apr May Jun 21 22 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 16:33:20 17:21:32 22:04:10 22:21:43 Oct 1 2 4 3 Oct 4, 2016 3 instances 17:51:56 18:19:42 21:15:45 Nov Dec 30