Total UN funding has grown steadily over the past decade. In 2010, the total revenue of the UN was US$ 39.6 billion. By 2021, total nominal revenue amounted to US$ 65.9 billion, an increase of US$ 3.3 billion or 5% compared to 2020. A detailed breakdown, by financial instrument, of total funding for 47 UN entities in 2021 can be explored in Table 1.
Funding of the UN system by financing instrument, 2021 (US$ billion)

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Source: Chief Executives Board for Coordination (CEB)
However, due to rising inflation rates and fluctuating exchange rates, UN funding actually decreased in real US$ value in 2021, thereby undermining the value of contributions. As illustrated in Figure 3, UN system revenue in real terms amounted to US$ 62.3 billion in 2021 compared to US$ 62.6 billion in 2020.
Nominal and real UN system funding, 2010–2021 (US$ billion)

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Note: Real values expressed in constant 2020 US dollars by applying deflators for resource flows from OECD-DAC countries, which consider both inflation and exchange rate movements.
Source: Chief Executives Board for Coordination (CEB) and OECD