20 instances from 4 years 2021 - 1 instance Jan Feb Mar 20 Apr May Jun Jul Aug Sep Oct Nov Dec 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 6 Jun 21, 2018 6 instances 17:53:56 17:53:59 18:05:27 18:05:30 18:09:36 18:09:39 22 Jul Aug Sep Oct Nov Dec 2017 - 11 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 11:11:16 11:21:29 11:27:48 12:06:10 19:20:08 20:03:00 Jul Aug 28 Sep Oct 2 2 Oct 2, 2017 2 instances 11:33:52 20:31:47 Nov Dec 25 2 Dec 25, 2017 2 instances 14:50:47 14:50:51