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 17:02:01 17:32:40 22:15:27 22:32:51 Oct 1 2 4 3 Oct 4, 2016 3 instances 17:58:58 18:27:16 21:22:59 Nov Dec 30