8 instances from 2 years 2018 - 4 instances Jan Feb Mar Apr May Jun 21 4 Jun 21, 2018 4 instances 07:10:12 07:10:15 07:16:18 20:48:34 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 22:10:58 23:42:27 Jul Aug Sep Oct 3 Nov Dec 25