18 instances from 6 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 16 Dec 2019 - 1 instance Jan Feb Mar Apr May Jun 22 Jul Aug Sep Oct Nov Dec 2018 - 1 instance Jan 12 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 2 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct Nov Dec 2016 - 11 instances Jan Feb Mar Apr May Jun 21 22 Jul Aug Sep 20 3 Sep 20, 2016 3 instances 15:23:24 16:14:06 21:12:31 30 2 Sep 30, 2016 2 instances 22:27:06 23:35:14 Oct 4 3 Oct 4, 2016 3 instances 16:32:53 17:05:07 19:42:52 Nov Dec 30