Country population rate of natural increase (RNI) and rank for world countries for the year 1964
| Rank | Country | Rate of Natural Increase | Population |
|---|---|---|---|
| 1 | Nigeria | 2.835 | 46,702,388 |
| 2 | Bhutan | 2.799 | 244,424 |
| 3 | Cambodia | 2.712 | 6,426,174 |
| 4 | Djibouti | 2.38 | 134,936 |
| 5 | Guinea | 1.858 | 3,236,427 |
Data from US Census International Database