15 instances from 4 years 2020 - 1 instance Jan 20 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2019 - 3 instances Jan Feb Mar Apr May Jun 22 Jul Aug Sep 18 Oct 26 Nov Dec 2017 - 1 instance Jan 8 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2016 - 10 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 4 Sep 20, 2016 4 instances 14:23:13 14:58:13 19:52:53 20:12:36 Oct 1 2 Oct 1, 2016 2 instances 20:54:45 22:09:37 4 3 Oct 4, 2016 3 instances 15:28:42 16:01:44 18:43:10 Nov Dec 30