19 instances from 9 years 2025 - 2 instances Jan Feb 27 Mar Apr May Jun Jul Aug 26 Sep Oct Nov Dec 2024 - 1 instance Jan Feb Mar Apr May Jun Jul Aug 27 Sep Oct Nov Dec 2023 - 1 instance Jan Feb Mar Apr May Jun Jul Aug 28 Sep Oct Nov Dec 2022 - 6 instances Jan 2 Feb 2 Mar 3 Apr May Jun Jul 20 19 18 Aug Sep Oct Nov Dec 2021 - 4 instances Jan Feb Mar Apr May 1 Jun Jul Aug 14 13 Sep Oct Nov Dec 2 2020 - 1 instance Jan Feb Mar Apr May Jun Jul Aug 11 Sep Oct Nov Dec 2019 - 2 instances Jan Feb Mar Apr May 7 Jun 14 Jul Aug Sep Oct Nov Dec 2018 - 1 instance Jan Feb Mar Apr May Jun 6 Jul Aug Sep Oct Nov Dec 2017 - 1 instance Jan Feb Mar Apr May Jun 6 Jul Aug Sep Oct Nov Dec