20 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2018 2 instances 17:39:08 23:15:49 22 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan 7 Feb Mar Apr May Jun 22 Jul Aug Sep Oct 3 Nov Dec 26 2016 - 12 instances Jan Feb Mar Apr May Jun 23 2 Jun 23, 2016 2 instances 08:46:19 18:24:54 Jul Aug Sep 19 20 3 Sep 20, 2016 3 instances 03:06:46 03:17:18 03:28:13 Oct 1 2 Oct 1, 2016 2 instances 10:05:48 10:07:04 4 3 Oct 4, 2016 3 instances 02:10:20 02:23:45 03:20:40 Nov Dec 29 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 16