Country population rate of natural increase (RNI) and rank for world countries for the year 1963
| Rank | Country | Rate of Natural Increase | Population |
|---|---|---|---|
| 1 | Nigeria | 2.831 | 45,355,131 |
| 2 | Cambodia | 2.75 | 6,253,081 |
| 3 | Bhutan | 2.739 | 234,543 |
| 4 | Djibouti | 2.359 | 128,521 |
| 5 | Guinea | 1.831 | 3,180,665 |
Data from US Census International Database