20 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 7 Jun 21, 2018 7 instances 07:01:32 07:01:34 07:06:54 18:56:00 19:06:58 19:11:17 20:45:21 22 Jul Aug Sep Oct Nov Dec 2017 - 2 instances Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 25 2 Dec 25, 2017 2 instances 06:14:43 15:28:44 2016 - 9 instances Jan Feb Mar Apr May Jun Jul Aug Sep 19 4 Sep 19, 2016 4 instances 20:57:31 21:03:05 21:03:06 21:03:18 Oct 1 2 Oct 1, 2016 2 instances 09:15:08 09:22:00 4 3 Oct 4, 2016 3 instances 05:10:41 05:17:02 05:25:52 Nov Dec