15 instances from 3 years 2018 - 1 instance Jan 3 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 1 instance Jan 7 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2016 - 13 instances Jan Feb Mar Apr May Jun 20 4 Jun 20, 2016 4 instances 13:20:15 19:28:00 20:02:52 21:37:55 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 06:01:50 06:14:05 06:22:19 06:23:21 Oct 1 2 Oct 1, 2016 2 instances 13:06:27 13:09:58 4 3 Oct 4, 2016 3 instances 05:13:57 05:26:41 06:23:48 Nov Dec