30 instances from 4 years 2019 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep 18 Oct Nov Dec 2018 - 7 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2018 2 instances 20:03:22 20:17:17 22 4 Jun 22, 2018 4 instances 04:36:13 10:53:17 11:05:34 23:51:03 23 Jul Aug Sep Oct Nov Dec 2017 - 14 instances Jan 6 2 Jan 6, 2017 2 instances 16:41:42 16:44:17 9 Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 12:41:28 13:05:00 13:26:10 18:51:16 19:10:19 19:34:12 Jul Aug Sep Oct 2 2 Oct 2, 2017 2 instances 12:49:50 20:00:22 Nov 20 Dec 25 26 2016 - 8 instances Jan Feb Mar Apr May Jun Jul Aug Sep 19 2 Sep 19, 2016 2 instances 11:16:26 11:23:33 30 2 Sep 30, 2016 2 instances 20:52:08 21:00:03 Oct 3 3 Oct 3, 2016 3 instances 13:53:53 13:53:57 13:55:41 Nov Dec 29