20 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:28:40 03:29:15 03:30:09 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:20:19 20:23:10 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 12 instances Jan Feb Mar Apr May Jun 20 3 Jun 20, 2016 3 instances 09:45:14 10:07:22 12:30:25 Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:14:10 17:17:49 17:20:27 Oct 1 2 Oct 1, 2016 2 instances 01:40:57 01:45:51 3 3 Oct 3, 2016 3 instances 17:21:05 17:25:54 17:26:27 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 18