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 20:08:20 20:22:09 22 4 Jun 22, 2018 4 instances 04:38:16 07:01:59 10:57:58 11:10:15 23 Jul Aug Sep Oct Nov Dec 2017 - 13 instances Jan 6 2 Jan 6, 2017 2 instances 16:47:29 16:49:46 9 Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 12:46:12 13:09:44 13:30:53 18:55:55 19:15:02 19:38:51 Jul Aug Sep Oct 2 2 Oct 2, 2017 2 instances 12:54:34 20:04:57 Nov Dec 25 26 2016 - 9 instances Jan Feb Mar Apr May Jun Jul Aug Sep 19 3 Sep 19, 2016 3 instances 11:21:13 11:26:49 11:28:22 30 2 Sep 30, 2016 2 instances 20:59:41 21:06:56 Oct 3 3 Oct 3, 2016 3 instances 14:04:35 14:04:40 14:06:18 Nov Dec 29