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 - 8 instances Jan Feb Mar Apr May Jun 21 8 Jun 21, 2018 8 instances 06:56:32 06:56:35 06:59:56 06:59:59 07:02:05 07:05:11 20:43:11 20:44:28 Jul Aug Sep Oct Nov Dec 2017 - 10 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 04:09:36 04:09:43 04:11:31 04:11:38 04:12:12 04:12:19 Jul Aug Sep Oct 2 2 Oct 2, 2017 2 instances 04:49:28 04:49:35 Nov Dec 25 2 Dec 25, 2017 2 instances 06:07:50 06:10:08