Where Data Tells the Story
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The Real gross domestic product (GDP) growth year-on-year percentage forecast tells us how much a country’s production of goods and services is expected to increase over a 12-month period, with inflation removed.
This helps us spot the fastest-growing economy.
It reveals which countries are actually producing and earning more in real terms, rather than just appearing to grow because prices have risen.
Using the latest available data from the OECD Economic Outlook, the visualization above shows year-on-year real GDP growth figures for all G20 economies.
It includes 2025 actuals and 2026-2027 projections.
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The world’s largest economy grew by 2.1% in 2025, below the OECD’s World average of 3.4% and the G20 aggregate of 3.3%.
To put it another way, that is 2.0% against a world average of 2.8% in 2026 and 1.8% against 3.1% in 2027.
The US is projected to grow below the world average in all three years of the forecast, with the deceleration consistent and directionally unambiguous.
The 2026 world growth deceleration corresponds to the OECD’s central estimate of the near-term cost of the Trump administration’s April 2025 tariff announcements to global economic output.
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