15 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:39:42 03:40:27 03:41:24 Jul Aug Sep Oct Nov Dec 2017 - 3 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 20:27:05 20:27:33 Jul Aug Sep Oct 2 Nov Dec 2016 - 8 instances Jan Feb Mar Apr May Jun Jul Aug Sep 19 3 Sep 19, 2016 3 instances 17:20:55 17:22:20 17:24:58 Oct 1 3 3 Oct 3, 2016 3 instances 17:25:28 17:30:17 17:30:50 Nov Dec 30 2015 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 17