12 instances from 4 years 2018 - 3 instances Jan Feb Mar Apr May Jun 21 3 Jun 21, 2018 3 instances 03:49:09 03:50:00 03:50:58 Jul Aug Sep Oct Nov Dec 2017 - 4 instances Jan Feb Mar Apr May Jun 21 2 Jun 21, 2017 2 instances 21:04:47 21:04:48 Jul Aug Sep Oct 2 Nov Dec 25 2016 - 3 instances Jan Feb Mar Apr May Jun 20 3 Jun 20, 2016 3 instances 10:06:57 10:12:42 13:09:39 Jul Aug Sep Oct Nov Dec 2015 - 2 instances Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 16 18