8 instances from 2 years 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 18:19:58 18:20:02 18:31:05 18:31:09 18:35:06 18:35:10 22 Jul Aug Sep Oct Nov Dec