Number of one-year-olds who are not vaccinated against diphtheria in Tonga
Tonga: Number of one-year-olds who are not vaccinated against diphtheria was 0.0333 one-year-olds per square kilometre in 2023. ◆ Volatile
Number of one-year-olds who are not vaccinated against diphtheria in Tonga, 1980–2023
Source: Statizoid (derived). Measured in one-year-olds per square kilometre.
Analysis
Tonga recorded 0.0333 one-year-olds per square kilometre for number of one-year-olds who are not vaccinated against diphtheria in 2023.
That represents a change of 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 diphtheria in Tonga peaked at 2.65 one-year-olds per square kilometre in 1981 and was at its lowest, 0.0328 one-year-olds per square kilometre, in 2021.
Tonga ranks 147th of 192 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 diphtheria in Tonga, year by year
| Year | one-year-olds per square kilometre | Change |
|---|---|---|
| 1980 | 2.56 one-year-olds per square kilometre | — |
| 1981 | 2.65 one-year-olds per square kilometre | +3.8% |
| 1982 | 2.01 one-year-olds per square kilometre | -24.3% |
| 1983 | 1.54 one-year-olds per square kilometre | -23.0% |
| 1984 | 2.05 one-year-olds per square kilometre | +32.8% |
| 1985 | 0.3376 one-year-olds per square kilometre | -83.5% |
| 1986 | 1.07 one-year-olds per square kilometre | +216.1% |
| 1987 | 0.0428 one-year-olds per square kilometre | -96.0% |
| 1988 | 0.3408 one-year-olds per square kilometre | +695.3% |
| 1989 | 0.2928 one-year-olds per square kilometre | -14.1% |
| 1990 | 0.2442 one-year-olds per square kilometre | -16.6% |
| 1991 | 0.4787 one-year-olds per square kilometre | +96.0% |
| 1992 | 0.0395 one-year-olds per square kilometre | -91.7% |
| 1993 | 0.1576 one-year-olds per square kilometre | +299.0% |
| 1994 | 0.434 one-year-olds per square kilometre | +175.4% |
| 1995 | 0.1992 one-year-olds per square kilometre | -54.1% |
| 1996 | 0.0402 one-year-olds per square kilometre | -79.8% |
| 1997 | 0.1596 one-year-olds per square kilometre | +297.1% |
| 1998 | 0.1192 one-year-olds per square kilometre | -25.3% |
| 1999 | 0.2388 one-year-olds per square kilometre | +100.4% |
| 2000 | 0.199 one-year-olds per square kilometre | -16.7% |
| 2001 | 0.2403 one-year-olds per square kilometre | +20.8% |
| 2002 | 0.4014 one-year-olds per square kilometre | +67.0% |
| 2003 | 0.0804 one-year-olds per square kilometre | -80.0% |
| 2004 | 0.0407 one-year-olds per square kilometre | -49.4% |
| 2005 | 0.0411 one-year-olds per square kilometre | +1.0% |
| 2006 | 0.0412 one-year-olds per square kilometre | +0.2% |
| 2007 | 0.041 one-year-olds per square kilometre | -0.5% |
| 2008 | 0.0405 one-year-olds per square kilometre | -1.1% |
| 2009 | 0.0398 one-year-olds per square kilometre | -1.9% |
| 2010 | 0.0393 one-year-olds per square kilometre | -1.1% |
| 2011 | 0.0406 one-year-olds per square kilometre | +3.1% |
| 2012 | 0.2015 one-year-olds per square kilometre | +396.7% |
| 2013 | 0.0387 one-year-olds per square kilometre | -80.8% |
| 2014 | 0.0761 one-year-olds per square kilometre | +96.8% |
| 2015 | 0.1509 one-year-olds per square kilometre | +98.4% |
| 2016 | 0.1496 one-year-olds per square kilometre | -0.9% |
| 2017 | 0.0361 one-year-olds per square kilometre | -75.9% |
| 2018 | 0.0347 one-year-olds per square kilometre | -3.9% |
| 2019 | 0.0338 one-year-olds per square kilometre | -2.6% |
| 2020 | 0.0331 one-year-olds per square kilometre | -2.1% |
| 2021 | 0.0328 one-year-olds per square kilometre | -0.9% |
| 2022 | 0.0331 one-year-olds per square kilometre | +1.0% |
| 2023 | 0.0333 one-year-olds per square kilometre | +0.6% |
Tonga compared with similar countries
- Tonga's 0.0333 one-year-olds per square kilometre is below the median for upper middle income countries, which is 0.0969 one-year-olds per square kilometre, 34% of the median. (58 countries reporting)
- Tonga's 0.0333 one-year-olds per square kilometre is below the median for East Asia & Pacific, which is 0.1666 one-year-olds per square kilometre, 20% of the median. (30 countries reporting)
Biggest year-on-year movements
Years where Number of one-year-olds who are not vaccinated against diphtheria 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 |
|---|---|---|---|
| 1988 | +695.3% | 0.0428 one-year-olds per square kilometre | 0.3408 one-year-olds per square kilometre |
| 2012 | +396.7% | 0.0406 one-year-olds per square kilometre | 0.2015 one-year-olds per square kilometre |
| 1993 | +299.0% | 0.0395 one-year-olds per square kilometre | 0.1576 one-year-olds per square kilometre |
| 1997 | +297.1% | 0.0402 one-year-olds per square kilometre | 0.1596 one-year-olds per square kilometre |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 1.29 one-year-olds per square kilometre | 0.0428 one-year-olds per square kilometre | 2.65 one-year-olds per square kilometre | 10 |
| 1990s | 0.2111 one-year-olds per square kilometre | 0.0395 one-year-olds per square kilometre | 0.4787 one-year-olds per square kilometre | 10 |
| 2000s | 0.1165 one-year-olds per square kilometre | 0.0398 one-year-olds per square kilometre | 0.4014 one-year-olds per square kilometre | 10 |
| 2010s | 0.0801 one-year-olds per square kilometre | 0.0338 one-year-olds per square kilometre | 0.2015 one-year-olds per square kilometre | 10 |
| 2020s | 0.0331 one-year-olds per square kilometre | 0.0328 one-year-olds per square kilometre | 0.0333 one-year-olds per square kilometre | 4 |
Countries ranked near Tonga
- 144 China 0.0421 one-year-olds per square kilometre compare
- 145 Eritrea 0.0387 one-year-olds per square kilometre compare
- 146 Lithuania 0.0379 one-year-olds per square kilometre compare
- 148 Tunisia 0.0324 one-year-olds per square kilometre compare
- 149 Albania 0.0315 one-year-olds per square kilometre compare
- 150 Brazil 0.0313 one-year-olds per square kilometre 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 diphtheria in Tonga?
- Number of one-year-olds who are not vaccinated against diphtheria in Tonga was 0.0333 one-year-olds per square kilometre in 2023, according to Statizoid (derived).
- What is the highest number of one-year-olds who are not vaccinated against diphtheria recorded in Tonga?
- The highest recorded value was 2.65 one-year-olds per square kilometre in 1981.
- What is the lowest number of one-year-olds who are not vaccinated against diphtheria recorded in Tonga?
- The lowest recorded value was 0.0328 one-year-olds per square kilometre in 2021.
- How does Tonga rank for number of one-year-olds who are not vaccinated against diphtheria?
- Tonga ranks 147th out of 192 countries with data for 2023.
- Is number of one-year-olds who are not vaccinated against diphtheria 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 Statizoid (derived), published as part of Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus, per square kilometre. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 44 observations, free to reuse under Derived by Statizoid from the sources named on the page.
How this figure is calculated
Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus divided by Land area (sq. km), matched on country and year. Neither publisher issues this ratio as a series; it is computed here from both.
Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus ÷ Land area (sq. km)
Computed from
- Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data
- Land area FAOSTAT, Food and Agriculture Organization of the United Nations (FAO)
Statizoid computes this series; the underlying measurements belong to the publishers named above. The arithmetic is applied to every country and year where both inputs report, and nothing is estimated unless the page says so.
About this data
Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus divided by Land area (sq. km), matched on country and year. Neither publisher issues this ratio as a series; it is computed here from both.