20 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:36:35 03:37:20 03:38:17 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:24:16 20:27:04 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 12 instances Jan Feb Mar Apr May Jun 20 4 Jun 20, 2016 4 instances 08:56:13 09:16:38 11:25:24 13:25:18 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:18:05 17:21:43 17:24:30 Oct 1 3 3 Oct 3, 2016 3 instances 17:24:59 17:29:48 17:30:21 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 17