20 instances from 4 years 2018 - 1 instance Jan Feb Mar Apr May Jun 21 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan 7 Feb Mar Apr May Jun 22 Jul Aug Sep Oct 3 Nov Dec 26 2016 - 14 instances Jan Feb 17 Mar Apr May Jun 21 23 2 Jun 23, 2016 2 instances 08:44:22 18:26:02 Jul Aug Sep 19 20 3 Sep 20, 2016 3 instances 03:06:21 03:16:53 03:27:48 Oct 1 2 Oct 1, 2016 2 instances 10:05:23 10:06:39 4 3 Oct 4, 2016 3 instances 02:09:56 02:23:20 03:20:15 Nov Dec 29 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 16