8 instances from 2 years 2018 - 4 instances Jan Feb Mar Apr May Jun 22 4 Jun 22, 2018 4 instances 16:26:40 18:22:48 18:59:30 19:10:23 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 21:58:38 23:30:27 Jul Aug Sep Oct 3 Nov Dec 26