8 instances from 2 years 2018 - 4 instances Jan Feb Mar Apr May Jun 22 4 Jun 22, 2018 4 instances 17:15:20 20:13:56 20:50:23 21:01:44 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 22 Jul Aug Sep Oct 3 Nov Dec 26