30 instances from 4 years 2019 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep 18 Oct Nov Dec 2018 - 8 instances Jan Feb Mar Apr May Jun 21 4 Jun 21, 2018 4 instances 14:40:22 15:09:27 15:16:41 15:24:34 22 3 Jun 22, 2018 3 instances 02:54:05 10:15:23 10:27:27 23 Jul Aug Sep Oct Nov Dec 2017 - 12 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 10:18:34 10:20:53 10:22:26 12:08:27 18:19:08 19:02:09 Jul Aug Sep Oct 2 2 Oct 2, 2017 2 instances 10:14:52 19:25:51 Nov 8 2 Nov 8, 2017 2 instances 20:19:30 20:19:39 Dec 25 2 Dec 25, 2017 2 instances 13:14:46 15:19:14 2016 - 9 instances Jan Feb Mar Apr May Jun Jul Aug Sep 19 4 Sep 19, 2016 4 instances 10:16:47 10:22:19 10:22:27 10:23:14 30 2 Sep 30, 2016 2 instances 19:24:21 19:30:26 Oct 3 3 Oct 3, 2016 3 instances 12:03:18 12:03:21 12:06:04 Nov Dec