25 instances from 8 years 2025 - 2 instances Jan Feb 21 Mar Apr May Jun Jul Aug 28 Sep Oct Nov Dec 2024 - 2 instances Jan Feb 20 Mar Apr May Jun Jul Aug 27 Sep Oct Nov Dec 2023 - 2 instances Jan Feb 19 Mar Apr May Jun Jul Aug 28 Sep Oct Nov Dec 2022 - 2 instances Jan Feb 15 Mar Apr May Jun Jul 18 Aug Sep Oct Nov Dec 2021 - 4 instances Jan 1 Feb 16 1 Mar Apr May Jun Jul Aug 13 Sep Oct Nov Dec 2020 - 10 instances Jan Feb 14 Mar Apr May 1 Jun 1 Jul 1 Aug 11 1 Sep 1 Oct 1 Nov 1 Dec 1 2019 - 2 instances Jan Feb 1 Mar Apr May Jun Jul Aug 8 Sep Oct Nov Dec 2018 - 1 instance Jan Feb 2 Mar Apr May Jun Jul Aug Sep Oct Nov Dec