18 instances from 6 years 2021 - 1 instance Jan Feb Mar Apr May Jun 26 Jul Aug Sep Oct Nov Dec 2020 - 3 instances Jan 23 Feb Mar Apr May Jun 28 Jul Aug Sep Oct Nov 13 Dec 2019 - 3 instances Jan Feb Mar Apr May Jun 22 Jul Aug Sep 18 Oct 26 Nov Dec 2018 - 1 instance Jan 1 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 2 instances Jan 6 Feb Mar Apr May Jun 29 Jul Aug Sep Oct Nov Dec 2016 - 8 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 4 Sep 20, 2016 4 instances 14:04:28 14:17:20 14:43:52 20:05:45 30 Oct 3 2 Oct 3, 2016 2 instances 15:02:27 15:47:01 Nov Dec 29