15 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 20:57:23 20:57:27 21:10:40 21:10:44 21:12:28 21:12:31 22 Jul Aug Sep Oct Nov Dec 2017 - 6 instances Jan Feb Mar Apr May Jun 21 6 Jun 21, 2017 6 instances 17:49:57 17:50:01 18:12:42 18:12:45 18:33:17 18:33:20 Jul Aug Sep Oct Nov Dec