40 instances from 4 years 2020 - 1 instance Jan Feb Mar Apr May Jun Jul Aug 4 Sep Oct Nov Dec 2018 - 6 instances Jan 4 5 4 Jan 5, 2018 4 instances 15:36:06 15:39:03 17:37:35 19:47:02 Feb Mar Apr May Jun 21 Jul Aug Sep Oct Nov Dec 2017 - 11 instances Jan 7 Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 03:54:24 03:56:25 22 Jul Aug 28 Sep Oct 2 2 Oct 2, 2017 2 instances 03:37:44 03:39:13 3 23 2 Oct 23, 2017 2 instances 14:17:41 14:19:12 Nov Dec 26 2016 - 22 instances Jan Feb Mar Apr May Jun 20 2 Jun 20, 2016 2 instances 08:32:17 08:48:29 Jul Aug Sep 20 2 Sep 20, 2016 2 instances 03:17:25 03:19:16 21 4 Sep 21, 2016 4 instances 20:49:25 21:19:06 21:22:45 21:37:45 Oct 1 4 Oct 1, 2016 4 instances 11:13:11 11:15:00 17:25:56 17:33:45 3 2 Oct 3, 2016 2 instances 11:20:15 11:22:16 4 5 Oct 4, 2016 5 instances 03:25:14 03:27:06 09:41:42 09:54:28 10:50:44 Nov Dec 30 31 2 Dec 31, 2016 2 instances 21:25:50 21:27:52