Number of one-year-olds who are not vaccinated against hepatitis B in Tonga
Tonga: Number of one-year-olds who are not vaccinated against hepatitis B was 23.98 one-year-olds in 2023. ◆ Volatile
Number of one-year-olds who are not vaccinated against hepatitis B in Tonga, 1990–2023
Source: WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data. Measured in one-year-olds.
Analysis
Tonga recorded 23.98 one-year-olds for number of one-year-olds who are not vaccinated against hepatitis b in 2023.
Compared with earlier readings it 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 hepatitis b in Tonga peaked at 511.92 one-year-olds in 1992 and was at its lowest, 23.6 one-year-olds, in 2021.
That places Tonga 180th out of 189 countries with data for 2023, putting it 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 hepatitis B in Tonga, year by year
| Year | one-year-olds | Change |
|---|---|---|
| 1990 | 175.86 one-year-olds | — |
| 1991 | 344.64 one-year-olds | +96.0% |
| 1992 | 511.92 one-year-olds | +48.5% |
| 1993 | 113.48 one-year-olds | -77.8% |
| 1994 | 284.1 one-year-olds | +150.4% |
| 1995 | 258.12 one-year-olds | -9.1% |
| 1996 | 173.64 one-year-olds | -32.7% |
| 1997 | 143.65 one-year-olds | -17.3% |
| 1998 | 114.4 one-year-olds | -20.4% |
| 1999 | 200.62 one-year-olds | +75.4% |
| 2000 | 85.95 one-year-olds | -57.2% |
| 2001 | 115.36 one-year-olds | +34.2% |
| 2002 | 144.5 one-year-olds | +25.3% |
| 2003 | 202.58 one-year-olds | +40.2% |
| 2004 | 29.29 one-year-olds | -85.5% |
| 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 | 58.38 one-year-olds | +97.9% |
| 2009 | 28.64 one-year-olds | -50.9% |
| 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 4,304 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 4,252 one-year-olds, 1% of the median. (30 countries reporting)
Biggest year-on-year movements
Years where Number of one-year-olds who are not vaccinated against hepatitis B 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 |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1990s | 232.04 one-year-olds | 113.48 one-year-olds | 511.92 one-year-olds | 10 |
| 2000s | 75.34 one-year-olds | 28.64 one-year-olds | 202.58 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
- 177 Brunei 62.76 one-year-olds compare
- 178 Seychelles 54.12 one-year-olds compare
- 179 Cook Islands 26.32 one-year-olds compare
- 181 Antigua and Barbuda 22.18 one-year-olds compare
- 182 San Marino 19.89 one-year-olds compare
- 183 Saint Kitts and Nevis 16.77 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 hepatitis b in Tonga?
- Number of one-year-olds who are not vaccinated against hepatitis b 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 hepatitis b recorded in Tonga?
- The highest recorded value was 511.92 one-year-olds in 1992.
- What is the lowest number of one-year-olds who are not vaccinated against hepatitis b 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 hepatitis b?
- Tonga ranks 180th out of 189 countries with data for 2023.
- Is number of one-year-olds who are not vaccinated against hepatitis b 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 hepatitis B. Statizoid updates them automatically from the source API.
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About this data
Number of one-year-olds who have not had three doses of the hepatitis B vaccine in a given year.