Red List Index in Tonga
Tonga: Red List Index was 0.75 index in 2025. ▼ Falling
Latest (2025)
0.75 index
Change on year
unchanged
World rank
200th
of 247 countries
All-time high
0.82 index
in 1983
All-time low
0.75 index
in 2024
Years of data
46
1980–2025
Red List Index in Tonga, 1980–2025
Source: BirdLife International and IUCN – processed by Our World in Data. Measured in index.
Analysis
In 2025, red list index in Tonga stood at 0.75 index. That is the lowest value across all 46 years on record.
The figure is down 5.1% over ten years.
Over the whole period, red list index in Tonga peaked at 0.82 index in 1983 and was at its lowest, 0.75 index, in 2024.
Tonga ranks 200th of 247 countries on this measure, in the bottom quarter.
The long-run direction has been consistently falling across the 46 years of available data.
Red List Index in Tonga, year by year
| Year | index | Change |
|---|---|---|
| 1980 | 0.81 index | — |
| 1981 | 0.81 index | +0.0% |
| 1982 | 0.81 index | +0.0% |
| 1983 | 0.82 index | +1.2% |
| 1984 | 0.82 index | +0.0% |
| 1985 | 0.82 index | +0.0% |
| 1986 | 0.82 index | +0.0% |
| 1987 | 0.82 index | +0.0% |
| 1988 | 0.82 index | +0.0% |
| 1989 | 0.82 index | +0.0% |
| 1990 | 0.82 index | +0.0% |
| 1991 | 0.82 index | +0.0% |
| 1992 | 0.82 index | +0.0% |
| 1993 | 0.82 index | +0.0% |
| 1994 | 0.82 index | +0.0% |
| 1995 | 0.82 index | +0.0% |
| 1996 | 0.82 index | +0.0% |
| 1997 | 0.82 index | +0.0% |
| 1998 | 0.82 index | +0.0% |
| 1999 | 0.81 index | -1.2% |
| 2000 | 0.81 index | +0.0% |
| 2001 | 0.81 index | +0.0% |
| 2002 | 0.81 index | +0.0% |
| 2003 | 0.82 index | +1.2% |
| 2004 | 0.81 index | -1.2% |
| 2005 | 0.81 index | +0.0% |
| 2006 | 0.81 index | +0.0% |
| 2007 | 0.81 index | +0.0% |
| 2008 | 0.81 index | +0.0% |
| 2009 | 0.81 index | +0.0% |
| 2010 | 0.8 index | -1.2% |
| 2011 | 0.8 index | +0.0% |
| 2012 | 0.8 index | +0.0% |
| 2013 | 0.79 index | -1.3% |
| 2014 | 0.79 index | +0.0% |
| 2015 | 0.79 index | +0.0% |
| 2016 | 0.78 index | -1.3% |
| 2017 | 0.78 index | +0.0% |
| 2018 | 0.77 index | -1.3% |
| 2019 | 0.77 index | +0.0% |
| 2020 | 0.77 index | +0.0% |
| 2021 | 0.76 index | -1.3% |
| 2022 | 0.76 index | +0.0% |
| 2023 | 0.76 index | +0.0% |
| 2024 | 0.75 index | -1.3% |
| 2025 | 0.75 index | +0.0% |
Tonga compared with similar countries
- Tonga's 0.75 index is below the median for upper middle income countries, which is 0.825 index, 91% of the median. (58 countries reporting)
- Tonga's 0.75 index is below the median for East Asia & Pacific, which is 0.81 index, 93% of the median. (37 countries reporting)
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 0.817 index | 0.81 index | 0.82 index | 10 |
| 1990s | 0.819 index | 0.81 index | 0.82 index | 10 |
| 2000s | 0.811 index | 0.81 index | 0.82 index | 10 |
| 2010s | 0.787 index | 0.77 index | 0.8 index | 10 |
| 2020s | 0.7583 index | 0.75 index | 0.77 index | 6 |
Countries ranked near Tonga
More reference data data for Tonga
- Emission Totals - Indirect emissions (N2O) - Manure applied to Soils 0.0105 (2050)
- Emission Totals - Indirect emissions (N2O) - Manure left on Pasture 0.0092 (2050)
- Emission Totals - Indirect emissions (N2O) - IPCC Agriculture 0.0197 (2050)
- Emission Totals - Indirect emissions (N2O) - Agricultural Soils 0.0197 (2050)
- Emission Totals - Emissions (N2O) - Manure applied to Soils 0.0353 (2050)
- Emission Totals - Emissions (N2O) - Manure Management 0.0269 (2050)
- Emission Totals - Emissions (N2O) - Manure left on Pasture 0.0446 (2050)
- Emission Totals - Emissions (N2O) - IPCC Agriculture 0.1068 (2050)
- Emission Totals - Emissions (N2O) - Agricultural Soils 0.0799 (2050)
- Emission Totals - Emissions (CO2eq) from N2O (AR5) - Manure applied 9.35 (2050)
Frequently asked questions
- What is red list index in Tonga?
- Red list index in Tonga was 0.75 index in 2025, according to BirdLife International and IUCN – processed by Our World in Data.
- What is the highest red list index recorded in Tonga?
- The highest recorded value was 0.82 index in 1983.
- What is the lowest red list index recorded in Tonga?
- The lowest recorded value was 0.75 index in 2024.
- How does Tonga rank for red list index?
- Tonga ranks 200th out of 247 countries with data for 2025.
- Is red list index rising or falling in Tonga?
- Over the last ten years it is down 5.1%. The long-run trend across the full record is falling.
- Where does this Tonga data come from?
- The figures come from BirdLife International and IUCN – processed by Our World in Data, published as part of Red List Index. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 46 observations, free to reuse under CC BY 4.0 (Our World in Data).
About this data
Red List Index.