Country population rate of natural increase (RNI) and rank for world countries for the year 1961
| Rank | Country | Rate of Natural Increase | Population |
|---|---|---|---|
| 1 | Nigeria | 2.82 | 42,785,256 |
| 2 | Bhutan | 2.598 | 217,631 |
| 3 | Djibouti | 2.318 | 116,664 |
| 4 | Guinea | 1.776 | 3,072,827 |
Data from US Census International Database