21 instances from 6 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 2019 - 1 instance Jan Feb Mar Apr May Jun 22 Jul Aug Sep Oct Nov Dec 2018 - 1 instance Jan 1 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 3 instances Jan 7 Feb Mar Apr May Jun 23 Jul Aug Sep Oct 9 Nov Dec 2016 - 14 instances Jan Feb Mar Apr May Jun 20 3 Jun 20, 2016 3 instances 14:01:02 17:51:13 22:35:20 21 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 14:52:10 15:26:43 20:23:13 20:40:08 Oct 1 2 Oct 1, 2016 2 instances 21:24:55 22:41:15 4 3 Oct 4, 2016 3 instances 15:59:15 16:33:58 19:13:52 Nov Dec 30