18 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 13 Dec 2019 - 1 instance Jan Feb Mar Apr May Jun 22 Jul Aug Sep Oct Nov Dec 2018 - 2 instances Jan 1 8 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 6 instances Jan 8 Feb Mar Apr May Jun 26 Jul Aug 29 3 Aug 29, 2017 3 instances 16:25:03 16:58:44 17:07:18 Sep Oct 9 Nov Dec 2016 - 7 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 Oct 1 2 Oct 1, 2016 2 instances 22:28:56 23:42:43 4 3 Oct 4, 2016 3 instances 17:08:15 17:36:25 20:14:18 Nov Dec 30