Births per 1,000 women, by age of mother
Fertility in Bulgaria, 1973
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1973
Total fertility rate: 2.15
The total fertility rate of Bulgaria was 2.15 children per woman in 1973 — above the replacement level of about 2.1. Births were most frequent among women aged 20-24 (193 per 1,000 women in that age group), and the average mother was 24.4 years old. In total, 139,965 babies were born. Source: United Nations, World Population Prospects 2024.
Key indicators, 1973
Total fertility rate
2.15
Births
139,965
Births per 1,000 people
16.2
Mean age of mothers
24.4
Births to mothers aged 15–19
16.9%
Net reproduction rate
1.01
Boys per 100 girls at birth
105.7
Population
8,624,800
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, 1973
| Mother's age | Births per 1,000 women | Share of total fertility | Births |
|---|---|---|---|
| 10-14 | 1.0 | 0.2% | 296 |
| 15-19 | 72.2 | 16.7% | 23,655 |
| 20-24 | 192.8 | 44.6% | 65,461 |
| 25-29 | 110.2 | 25.5% | 34,506 |
| 30-34 | 40.1 | 9.3% | 11,148 |
| 35-39 | 12.6 | 2.9% | 3,843 |
| 40-44 | 3.0 | 0.7% | 950 |
| 45-49 | 0.2 | 0.1% | 79 |
| 50-54 | 0.1 | 0.0% | 26 |
Fertility in Bulgaria by year