20 instances from 5 years 2021 - 1 instance Jan Feb Mar Apr May Jun 26 Jul Aug Sep Oct Nov Dec 2020 - 3 instances Jan 19 Feb Mar Apr May Jun Jul 1 Aug Sep Oct Nov 12 Dec 2019 - 3 instances Jan Feb Mar Apr May Jun Jul 20 Aug Sep 18 Oct 26 Nov Dec 2017 - 4 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct Nov 20 2 Nov 20, 2017 2 instances 20:03:30 21:23:31 Dec 2016 - 9 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 4 Sep 20, 2016 4 instances 14:48:14 15:22:47 20:19:12 20:36:11 Oct 1 4 3 Oct 4, 2016 3 instances 15:51:50 16:26:14 19:06:22 Nov Dec 30