8 instances from 2 years 2018 - 4 instances Jan Feb Mar Apr May Jun 22 4 Jun 22, 2018 4 instances 16:26:44 18:22:55 18:59:37 19:10:31 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 21:58:32 23:30:20 Jul Aug Sep Oct 3 Nov Dec 25