20 instances from 3 years 2018 - 1 instance Jan 7 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 6 instances Jan 4 13 Feb Mar Apr May Jun Jul 2 Aug Sep Oct 8 3 Oct 8, 2017 3 instances 01:11:10 01:21:18 02:38:15 Nov Dec 2016 - 13 instances Jan Feb Mar Apr May Jun 20 4 Jun 20, 2016 4 instances 10:07:05 12:32:39 12:47:27 12:54:41 Jul Aug Sep 19 4 Sep 19, 2016 4 instances 19:57:13 20:02:25 20:19:35 20:26:03 Oct 1 2 Oct 1, 2016 2 instances 02:34:46 02:39:52 3 3 Oct 3, 2016 3 instances 18:41:42 18:57:01 19:52:35 Nov Dec