20 instances from 4 years 2021 - 1 instance Jan Feb Mar 21 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 - 8 instances Jan Feb Mar Apr May Jun 21 7 Jun 21, 2018 7 instances 05:24:05 05:25:11 05:27:59 05:29:28 19:45:57 19:50:08 20:13:06 22 Jul Aug Sep Oct Nov Dec 2017 - 10 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 03:13:23 03:13:42 03:15:13 03:19:20 12:27:17 12:49:28 Jul Aug Sep Oct 2 Nov 2 8 Dec 25