15 instances from 5 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 3 Jun 21, 2018 3 instances 19:16:19 19:24:59 19:29:20 22 Jul Aug Sep Oct Nov Dec 2017 - 7 instances Jan 6 2 Jan 6, 2017 2 instances 15:40:05 20:13:23 Feb Mar Apr May Jun 21 3 Jun 21, 2017 3 instances 12:08:08 12:30:29 12:54:37 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 2 instances Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov 2 3 Dec