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| Population (in billions) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Year | 1804 | 1927 | 1959 | 1974 | 1987 | 1999 | 2011 | 2023 |
| Elapsed | – | 123 | 32 | 15 | 13 | 12 | 12 | 12 |
>World Overpopulation Awareness
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>
| Population (in billions) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Year | 1804 | 1927 | 1959 | 1974 | 1987 | 1999 | 2011 | 2023 |
| Elapsed | – | 123 | 32 | 15 | 13 | 12 | 12 | 12 |