12 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 - 4 instances Jan Feb Mar Apr May Jun 21 4 Jun 21, 2018 4 instances 04:39:02 04:39:08 04:40:46 19:55:27 Jul Aug Sep Oct Nov Dec 2017 - 6 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2017 3 instances 11:01:51 11:11:24 11:23:05 Jul Aug 28 Sep Oct 2 Nov Dec 25