20 instances from 4 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 Aug Sep Oct Nov 13 19 Dec 2017 - 4 instances Jan 9 Feb Mar Apr May Jun 25 Jul Aug Sep Oct 6 Nov Dec 30 2016 - 13 instances Jan Feb Mar Apr May Jun 20 3 Jun 20, 2016 3 instances 14:05:48 17:41:02 22:39:33 21 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 15:49:55 16:33:14 18:05:53 30 2 Sep 30, 2016 2 instances 21:58:22 23:07:24 Oct 3 3 Oct 3, 2016 3 instances 15:12:08 15:26:07 16:09:44 Nov Dec 31