20 instances from 5 years 2021 - 1 instance Jan Feb Mar Apr May Jun 26 Jul Aug Sep Oct Nov Dec 2020 - 2 instances Jan Feb Mar Apr May Jun Jul 1 Aug Sep Oct Nov 14 Dec 2019 - 2 instances Jan Feb Mar Apr May Jun Jul 20 Aug Sep 18 Oct Nov Dec 2017 - 2 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct Nov Dec 2016 - 13 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2016 2 instances 11:14:45 19:23:51 22 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 15:49:13 16:39:28 21:20:32 21:38:03 Oct 1 2 Oct 1, 2016 2 instances 22:30:32 23:44:05 4 3 Oct 4, 2016 3 instances 17:09:52 17:38:02 20:15:55 Nov Dec 30