Japan vs Tonga: Red List Index
Japan
0.74 index
in 2025
Tonga
0.75 index
in 2025
Japan rank
203rd
Tonga rank
200th
Red List Index over time
- Japan
- Tonga
How they compare
Tonga currently reports 0.75 index against 0.74 index in Japan, a difference of 0.01 index.
Across all 46 years both countries report, Tonga has been ahead every year.
Japan ranks 203rd and Tonga ranks 200th of 247 countries.
Tonga has averaged higher in every one of the 5 decades both report.
Head to head by decade
| Decade | Japan | Tonga | Difference | Ahead |
|---|---|---|---|---|
| 1980s | 0.78 index | 0.817 index | 0.037 index | Tonga |
| 1990s | 0.78 index | 0.819 index | 0.039 index | Tonga |
| 2000s | 0.773 index | 0.811 index | 0.038 index | Tonga |
| 2010s | 0.761 index | 0.787 index | 0.026 index | Tonga |
| 2020s | 0.745 index | 0.7583 index | 0.0133 index | Tonga |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher red list index, Japan or Tonga?
- Tonga, at 0.75 index against 0.74 index in Japan as of 2025.
- What is the difference in red list index between Japan and Tonga?
- 0.01 index, with Tonga ahead.
- How many years of comparable data are there for Japan and Tonga?
- 46 years are reported by both, from 1980 to 2025.
- How do Japan and Tonga rank globally for red list index?
- Japan ranks 203rd and Tonga ranks 200th of 247 countries.
- Where does this data come from?
- BirdLife International and IUCN – processed by Our World in Data, published as Red List Index. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Red List Index.