Number of one-year-olds who are not vaccinated against polio in Tonga
Tonga: Number of one-year-olds who are not vaccinated against polio was 23.98 one-year-olds in 2023. ◆ Volatile
Latest (2023)
23.98 one-year-olds
Change on year
up 0.6%
World rank
184th
of 194 countries
All-time high
2,454 one-year-olds
in 1980
All-time low
23.6 one-year-olds
in 2021
Years of data
44
1980–2023
Number of one-year-olds who are not vaccinated against polio in Tonga, 1980–2023
Source: WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data. Measured in one-year-olds.
Analysis
In 2023, number of one-year-olds who are not vaccinated against polio in Tonga stood at 23.98 one-year-olds.
The figure is up 0.6% on the previous year and down 13.8% over ten years.
Over the whole period, number of one-year-olds who are not vaccinated against polio in Tonga peaked at 2,454 one-year-olds in 1980 and was at its lowest, 23.6 one-year-olds, in 2021.
Tonga ranks 184th of 194 countries on this measure, in the bottom quarter.
The series is highly variable year to year, so single readings are best treated with caution.
Number of one-year-olds who are not vaccinated against polio in Tonga, year by year
| Year | one-year-olds | Change |
|---|---|---|
| 1980 | 2,454 one-year-olds | — |
| 1981 | 1,910 one-year-olds | -22.2% |
| 1982 | 602.2 one-year-olds | -68.5% |
| 1983 | 1,293 one-year-olds | +114.6% |
| 1984 | 1,628 one-year-olds | +25.9% |
| 1985 | 577.22 one-year-olds | -64.5% |
| 1986 | 829.71 one-year-olds | +43.7% |
| 1987 | 401.05 one-year-olds | -51.7% |
| 1988 | 245.36 one-year-olds | -38.8% |
| 1989 | 210.84 one-year-olds | -14.1% |
| 1990 | 205.17 one-year-olds | -2.7% |
| 1991 | 229.76 one-year-olds | +12.0% |
| 1992 | 28.44 one-year-olds | -87.6% |
| 1993 | 113.48 one-year-olds | +299.0% |
| 1994 | 284.1 one-year-olds | +150.4% |
| 1995 | 200.76 one-year-olds | -29.3% |
| 1996 | 28.94 one-year-olds | -85.6% |
| 1997 | 114.92 one-year-olds | +297.1% |
| 1998 | 85.8 one-year-olds | -25.3% |
| 1999 | 171.96 one-year-olds | +100.4% |
| 2000 | 143.25 one-year-olds | -16.7% |
| 2001 | 144.2 one-year-olds | +0.7% |
| 2002 | 289 one-year-olds | +100.4% |
| 2003 | 57.88 one-year-olds | -80.0% |
| 2004 | 29.29 one-year-olds | -49.4% |
| 2005 | 29.59 one-year-olds | +1.0% |
| 2006 | 29.65 one-year-olds | +0.2% |
| 2007 | 29.5 one-year-olds | -0.5% |
| 2008 | 29.19 one-year-olds | -1.1% |
| 2009 | 28.64 one-year-olds | -1.9% |
| 2010 | 28.33 one-year-olds | -1.1% |
| 2011 | 29.21 one-year-olds | +3.1% |
| 2012 | 145.1 one-year-olds | +396.7% |
| 2013 | 27.83 one-year-olds | -80.8% |
| 2014 | 54.76 one-year-olds | +96.8% |
| 2015 | 108.64 one-year-olds | +98.4% |
| 2016 | 107.68 one-year-olds | -0.9% |
| 2017 | 25.99 one-year-olds | -75.9% |
| 2018 | 24.98 one-year-olds | -3.9% |
| 2019 | 24.33 one-year-olds | -2.6% |
| 2020 | 23.81 one-year-olds | -2.1% |
| 2021 | 23.6 one-year-olds | -0.9% |
| 2022 | 23.84 one-year-olds | +1.0% |
| 2023 | 23.98 one-year-olds | +0.6% |
Tonga compared with similar countries
- Tonga's 23.98 one-year-olds is below the median for upper middle income countries, which is 4,188 one-year-olds, 1% of the median. (58 countries reporting)
- Tonga's 23.98 one-year-olds is below the median for East Asia & Pacific, which is 6,080 one-year-olds, 0% of the median. (30 countries reporting)
Biggest year-on-year movements
Years where Number of one-year-olds who are not vaccinated against polio in Tonga changed far more than this series normally does. A large move can be a real event or a change in how the figure was measured — the source note below says who published it.
| Year | Change | From | To |
|---|---|---|---|
| 2012 | +396.7% | 29.21 one-year-olds | 145.1 one-year-olds |
| 1993 | +299.0% | 28.44 one-year-olds | 113.48 one-year-olds |
| 1997 | +297.1% | 28.94 one-year-olds | 114.92 one-year-olds |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 1,015 one-year-olds | 210.84 one-year-olds | 2,454 one-year-olds | 10 |
| 1990s | 146.33 one-year-olds | 28.44 one-year-olds | 284.1 one-year-olds | 10 |
| 2000s | 81.02 one-year-olds | 28.64 one-year-olds | 289 one-year-olds | 10 |
| 2010s | 57.69 one-year-olds | 24.33 one-year-olds | 145.1 one-year-olds | 10 |
| 2020s | 23.81 one-year-olds | 23.6 one-year-olds | 23.98 one-year-olds | 4 |
Countries ranked near Tonga
- 181 Maldives 59.3 one-year-olds compare
- 182 Seychelles 54.12 one-year-olds compare
- 183 Cook Islands 26.32 one-year-olds compare
- 185 Saint Kitts and Nevis 22.36 one-year-olds compare
- 186 Antigua and Barbuda 22.18 one-year-olds compare
- 187 San Marino 19.89 one-year-olds compare
More health data for Tonga
- Un projection of annual infant deaths, annual growth rate -33.33 % change on previous year (2100)
- Heat deaths vs projected death rates, annual growth rate 2.33 % change on previous year (2090)
- Estimated changes in temperature-related death rates compared to projected death rates 834.5 deaths per 1,000 people (2090)
- Number of infants who die before age 1 2 deaths (2100)
- Neonatal tetanus - number of reported cases, gaps filled 0 (2025)
- Population ages 00-04, female, annual growth rate -1.42 % change on previous year (2025)
- Population ages 00-04, female, per unit of GDP 0 units per US$ of GDP (2025)
- Population ages 00-04, female, per capita 0.0535 units per person (2025)
- Population ages 00-04, male, annual growth rate -1.36 % change on previous year (2025)
- Population ages 00-04, male, per unit of GDP 0 units per US$ of GDP (2025)
Frequently asked questions
- What is number of one-year-olds who are not vaccinated against polio in Tonga?
- Number of one-year-olds who are not vaccinated against polio in Tonga was 23.98 one-year-olds in 2023, according to WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data.
- What is the highest number of one-year-olds who are not vaccinated against polio recorded in Tonga?
- The highest recorded value was 2,454 one-year-olds in 1980.
- What is the lowest number of one-year-olds who are not vaccinated against polio recorded in Tonga?
- The lowest recorded value was 23.6 one-year-olds in 2021.
- How does Tonga rank for number of one-year-olds who are not vaccinated against polio?
- Tonga ranks 184th out of 194 countries with data for 2023.
- Is number of one-year-olds who are not vaccinated against polio rising or falling in Tonga?
- Over the last ten years it is down 13.8%. The long-run trend across the full record is volatile.
- Where does this Tonga data come from?
- The figures come from WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data, published as part of Number of one-year-olds who are not vaccinated against polio. Statizoid updates them automatically from the source API.
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About this data
Number of one-year-olds who have not had the third dose of either the oral or inactivated polio vaccine in a given year.