Annexes (p. 54-73): 1. Summary of the evolution of the elements in the methodology used for the preparation of the United Nations scale of assessments -- 2. Outline of the methodology used for the preparation of the United Nations scale of assessments for the period 2016-2018 -- 3. Explanation of exchange rates used in the scale methodology -- 4. Systematic criteria to identify Member States for which market exchange rates may be reviewed for possible replacement -- 5. Review of scale-to-scale changes between the 2016-2018 scale and the 2019-2021 scale, calculated using the 2016-2018 scale methodology.