20 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2018 2 instances 17:38:21 23:15:04 22 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 - 12 instances Jan Feb Mar Apr May Jun 23 2 Jun 23, 2016 2 instances 08:46:03 18:25:03 Jul Aug Sep 19 20 3 Sep 20, 2016 3 instances 03:06:02 03:16:34 03:27:29 Oct 1 2 Oct 1, 2016 2 instances 10:05:04 10:06:20 4 3 Oct 4, 2016 3 instances 02:09:37 02:23:01 03:19:56 Nov Dec 29 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 16