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The chart at the left shows the evolution of 'Arria-formula' meetings from their inception in 1992 to the year 2023.


As indicated, all Arrias were closed from 1992 until 2009. As of 2016, open Arrias have become the norm.


For a complete list of all 'Arria-formula' meetings, see the Arria Table maintained by the Security Council Practices and Charter Research Branch of the UN's Security Council Affairs Division, which is updated on a monthly basis.

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