20 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:34:34 03:35:45 03:37:03 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:23:03 20:25:52 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 12 instances Jan Feb Mar Apr May Jun 20 4 Jun 20, 2016 4 instances 08:52:40 09:13:06 11:25:14 13:21:11 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:16:53 17:20:31 17:23:16 Oct 1 3 3 Oct 3, 2016 3 instances 17:23:46 17:28:36 17:29:09 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 18