24 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 24 27 Jul Aug Sep Oct Nov Dec 2017 - 7 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct 2 3 Oct 2, 2017 3 instances 23:01:12 23:02:38 23:18:58 4 Nov Dec 29 2016 - 13 instances Jan Feb 17 Mar Apr May Jun 21 22 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 17:15:35 17:42:06 22:25:56 22:44:26 Oct 1 2 4 3 Oct 4, 2016 3 instances 18:13:17 18:40:30 21:40:01 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 16