Country population rate of natural increase (RNI) and rank for world countries for the year 1957
| Rank | Country | Rate of Natural Increase | Population |
|---|---|---|---|
| 1 | Nigeria | 2.79 | 38,093,519 |
| 2 | Bhutan | 2.59 | 196,179 |
| 3 | Djibouti | 2.231 | 96,377 |
| 4 | Guinea | 1.662 | 2,875,481 |
Data from US Census International Database