15 instances from 3 years 2019 - 1 instance Jan Feb Mar Apr May Jun 22 Jul Aug Sep Oct Nov Dec 2017 - 2 instances Jan 8 Feb Mar Apr May Jun 23 Jul Aug Sep Oct Nov Dec 2016 - 12 instances Jan Feb Mar Apr May Jun 21 22 Jul Aug Sep 20 4 Sep 20, 2016 4 instances 17:02:08 17:32:46 22:15:34 22:32:57 Oct 1 2 4 3 Oct 4, 2016 3 instances 17:59:04 18:27:22 21:23:05 Nov Dec 30