20 instances from 4 years 2019 - 1 instance Jan Feb 18 Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2017 - 3 instances Jan 6 Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 01:46:13 01:48:00 Jul Aug Sep Oct Nov Dec 2016 - 15 instances Jan Feb 17 Mar Apr May Jun 20 4 Jun 20, 2016 4 instances 08:13:21 08:44:44 09:57:39 14:13:41 Jul Aug Sep 19 4 Sep 19, 2016 4 instances 10:05:14 10:05:44 10:09:58 11:28:26 30 Oct 3 4 Oct 3, 2016 4 instances 09:16:43 10:05:17 10:21:32 11:37:14 Nov Dec 29 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 16