16 instances from 4 years 2020 - 1 instance Jan 19 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2019 - 2 instances Jan Feb Mar Apr May Jun Jul 20 Aug Sep 18 Oct 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 20:06:50 21:26:55 Dec 2016 - 9 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 4 Sep 20, 2016 4 instances 14:48:05 15:22:38 20:19:02 20:36:02 Oct 1 4 3 Oct 4, 2016 3 instances 15:51:40 16:26:05 19:06:13 Nov Dec 30