20 instances from 5 years 2021 - 1 instance Jan Feb Mar Apr May Jun 27 Jul Aug Sep Oct Nov Dec 2020 - 1 instance Jan Feb Mar Apr May Jun 28 Jul Aug Sep Oct Nov Dec 2018 - 2 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2018 2 instances 05:12:23 05:12:36 Jul Aug Sep Oct Nov Dec 2017 - 5 instances Jan 6 Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 10:07:57 10:12:17 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 11 instances Jan Feb Mar Apr May Jun 20 4 Jun 20, 2016 4 instances 13:25:46 13:45:37 14:18:50 14:35:31 Jul Aug Sep 19 2 Sep 19, 2016 2 instances 17:06:22 17:09:17 30 Oct 3 3 Oct 3, 2016 3 instances 15:11:42 15:29:24 15:47:18 Nov Dec 29