18 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:29:58 03:30:33 03:34:48 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:21:36 20:24:26 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 10 instances Jan Feb Mar Apr May Jun 20 2 Jun 20, 2016 2 instances 08:39:57 13:19:55 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:15:27 17:19:05 17:21:44 Oct 1 3 3 Oct 3, 2016 3 instances 17:22:21 17:27:10 17:27:43 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 18