18 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:35:09 03:36:26 03:37:22 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:23:22 20:26:11 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 10 instances Jan Feb Mar Apr May Jun 20 2 Jun 20, 2016 2 instances 08:40:42 08:44:52 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:17:12 17:20:50 17:23:36 Oct 1 3 3 Oct 3, 2016 3 instances 17:24:06 17:28:55 17:29:28 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 18