20 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:28:11 03:28:47 03:29:40 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:19:51 20:22:42 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 12 instances Jan Feb Mar Apr May Jun 20 3 Jun 20, 2016 3 instances 09:42:51 10:06:54 12:29:54 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:13:42 17:17:21 17:19:59 Oct 1 2 Oct 1, 2016 2 instances 01:40:28 01:45:23 3 3 Oct 3, 2016 3 instances 17:20:37 17:25:26 17:25:59 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 18