Country population rate of natural increase (RNI) and rank for world countries for the year 1968
| Rank | Country | Rate of Natural Increase | Population |
|---|---|---|---|
| 1 | Bhutan | 2.959 | 288,134 |
| 2 | Nigeria | 2.849 | 52,500,134 |
| 3 | Cambodia | 2.576 | 7,142,389 |
| 4 | Djibouti | 2.458 | 163,858 |
| 5 | Guinea | 1.947 | 3,471,858 |
Data from US Census International Database