20 instances from 4 years 2021 - 1 instance Jan Feb Mar 20 Apr May Jun Jul Aug Sep Oct Nov Dec 2019 - 1 instance Jan Feb Mar Apr May Jun Jul Aug Sep 18 Oct Nov Dec 2018 - 7 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2018 6 instances 17:54:23 17:54:27 18:05:54 18:05:58 18:10:03 18:10:06 22 Jul Aug Sep Oct Nov Dec 2017 - 11 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 11:11:37 11:21:49 11:28:08 12:06:17 19:20:15 20:03:07 Jul Aug 28 Sep Oct 2 2 Oct 2, 2017 2 instances 11:34:11 20:31:54 Nov Dec 25 2 Dec 25, 2017 2 instances 14:51:14 14:51:17