| Annam | Cochinchina | Tonkin | Vietnam | |
| 1901 | 4.5 | 3.0 | 5.5 | 13 |
| 1911 | 5.5 | 3.8 | 6.1 | 14.7 |
| 1921 | 4.9 | 3.8 | 6.9 | 15.8 |
| 1926 | 5.6 | 4.1 | 7.4 | 17.1 |
| 1931 | 5.1 | 4.8 | 8.1 | 17.7 |
| 1936 | 5.7 | 4.6 | 8.7 | 19.0 |
| 1943 | 7.2 | 5.6 | 9.8 | 22.6 |
| North Vietnam | South Vietnam | Vietnam | |
| 1955 | 13.6 | 13.6 | 27.2 |
Sources: Indochina Statistical Yearbooks, Vietnam Statistical Yearbooks