15 instances from 4 years 2020 - 2 instances Jan 18 Feb Mar Apr May Jun 29 Jul Aug Sep Oct Nov Dec 2019 - 4 instances Jan Feb 27 Mar 5 Apr May Jun Jul 20 Aug Sep Oct 26 Nov Dec 2018 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2018 2 instances 12:08:20 20:27:53 22 Jul Aug Sep 24 Oct Nov Dec 2017 - 5 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 15:20:15 17:30:11 Jul Aug Sep Oct 2 2 Oct 2, 2017 2 instances 05:07:49 12:04:13 Nov Dec 26