In 1964, the world’s rate of natural increase (RNI)—the difference between birth rates and death rates, excluding migration—was at a historical high, averaging about 2% per year. This global surge was fueled by dramatic declines in mortality, especially in developing regions, while birth rates remained elevated. Africa and Asia exhibited the highest RNIs, with many countries, such as Nigeria and India, experiencing annual increases above 2.5%. Latin America also saw rapid growth, with RNIs often between 2% and 3%. In contrast, Europe’s RNI was much lower, frequently under 1%, as both birth and death rates had declined earlier due to demographic transition. North America’s RNI was moderate, around 1.3%, reflecting a post-war baby boom tapering off. Within continents, disparities were notable: for example, Japan’s RNI was below 1% due to early fertility decline, while neighboring South Korea’s was much higher. Thus, while the world as a whole experienced unprecedented population growth in 1964, the pace varied widely, with developing countries driving the global increase and developed nations already transitioning to slower growth.
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