15 instances from 3 years 2018 - 1 instance Jan Feb Mar Apr May Jun Jul 13 Aug Sep Oct Nov Dec 2017 - 4 instances Jan 6 7 Feb Mar Apr May Jun 22 Jul Aug Sep Oct Nov Dec 31 2016 - 10 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 2 Sep 20, 2016 2 instances 18:57:07 19:02:30 21 2 Sep 21, 2016 2 instances 01:21:19 05:22:30 Oct 1 2 Oct 1, 2016 2 instances 05:35:06 05:39:57 3 3 Oct 3, 2016 3 instances 21:09:22 21:09:22 21:54:33 Nov Dec 29