18 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:28:46 03:29:21 03:30:15 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:20:26 20:23:16 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 10 instances Jan Feb Mar Apr May Jun 20 2 Jun 20, 2016 2 instances 09:42:23 10:06:47 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:14:16 17:17:55 17:20:34 Oct 1 3 3 Oct 3, 2016 3 instances 17:21:11 17:26:01 17:26:33 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 18