Fertility in Tonga, 1975
Tonga
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World
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1975
Total fertility rate: 5.75
The total fertility rate of Tonga was 5.75 children per woman in 1975 — above the replacement level of about 2.1. Births were most frequent among women aged 25-29 (313 per 1,000 women in that age group), and the average mother was 30.5 years old. In total, 3,331 babies were born. Source: United Nations, World Population Prospects 2024.
Key indicators, 1975
Total fertility rate
5.75
Births
3,331
Births per 1,000 people
35.8
Mean age of mothers
30.5
Births to mothers aged 15–19
8.9%
Net reproduction rate
2.56
Boys per 100 girls at birth
108.3
Population
93,018
The net reproduction rate counts only daughters who survive to their mothers' age: below 1, each generation of women is smaller than the one before.
Fertility by age of mother, 1975
| Mother's age | Births per 1,000 women | Share of total fertility | Births |
|---|---|---|---|
| 10-14 | 0.7 | 0.1% | 4 |
| 15-19 | 58.6 | 5.1% | 295 |
| 20-24 | 192.0 | 16.8% | 729 |
| 25-29 | 313.1 | 27.3% | 928 |
| 30-34 | 255.8 | 22.3% | 661 |
| 35-39 | 228.3 | 19.9% | 522 |
| 40-44 | 81.6 | 7.1% | 164 |
| 45-49 | 14.1 | 1.2% | 24 |
| 50-54 | 0.5 | 0.0% | 0 |
Fertility in Tonga by year