20 instances from 5 years 2021 - 1 instance Jan Feb Mar Apr May Jun 26 Jul Aug Sep Oct Nov Dec 2020 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov 12 Dec 2018 - 3 instances Jan Feb Mar Apr May Jun 29 Jul 1 12 Aug Sep Oct Nov Dec 2017 - 3 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct Nov Dec 31 2016 - 12 instances Jan Feb Mar Apr May Jun 21 22 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 16:01:39 16:50:41 21:32:31 21:50:02 Oct 1 2 Oct 1, 2016 2 instances 22:42:52 23:55:38 4 3 Oct 4, 2016 3 instances 17:22:07 17:49:45 20:28:06 Nov Dec 30