20 instances from 4 years 2020 - 2 instances Jan Feb 8 Mar Apr May Jun Jul Aug Sep Oct Nov 14 Dec 2018 - 4 instances Jan Feb Mar Apr May Jun 21 4 Jun 21, 2018 4 instances 04:52:41 04:53:37 04:55:30 15:20:34 Jul Aug Sep Oct Nov Dec 2017 - 6 instances Jan 7 8 Feb Mar Apr May Jun 22 Jul Aug Sep Oct 2 Nov 2 Dec 26 2016 - 8 instances Jan Feb Mar Apr May Jun Jul Aug Sep 20 4 Sep 20, 2016 4 instances 13:08:39 13:52:03 14:05:40 14:30:23 Oct 2 2 Oct 2, 2016 2 instances 03:31:25 09:13:40 4 Nov Dec 30