Estimated approximation of the world population in 100-year increments, starting from 2023 and going back 5,000 years:

| Year | Estimated World Population |
|--------|----------------------------|
| 2023 | 8 billion |
| 1923 | 2 billion |
| 1823 | 1.1 billion |
| 1723 | 740 million |
| 1623 | 545 million |
| 1523 | 460 million |
| 1423 | 375 million |
| 1323 | 360 million |
| 1223 | 360 million |
| 1123 | 320 million |
| 1023 | 310 million |
| 923 | 275 million |
| 823 | 240 million |
| 723 | 210 million |
| 623 | 200 million |
| 523 | 190 million |
| 423 | 180 million |
| 323 | 170 million |
| 223 | 170 million |
| 123 | 150 million |
| 23 | 170 million |
| 100 BCE | 150 million |
| 200 BCE | 150 million |
| 300 BCE | 100 million |
| 400 BCE | 100 million |
| 500 BCE | 100 million |
| 600 BCE | 100 million |
| 700 BCE | 90 million |
| 800 BCE | 85 million |
| 900 BCE | 80 million |
| 1000 BCE | 75 million |
| 1100 BCE | 72 million |
| 1200 BCE | 70 million |
| 1300 BCE | 65 million |
| 1400 BCE | 60 million |
| 1500 BCE | 50 million |
| 1600 BCE | 45 million |
| 1700 BCE | 40 million |
| 1800 BCE | 35 million |
| 1900 BCE | 30 million |
| 2000 BCE | 27 million |
| 2100 BCE | 25 million |
| 2200 BCE | 23 million |
| 2300 BCE | 20 million |
| 2400 BCE | 18 million |
| 2500 BCE | 15 million |
| 2600 BCE | 12 million |
| 2700 BCE | 10 million |
| 2800 BCE | 7 million |
| 2900 BCE | 5 million |
| 3000 BCE | 3 million |

### Explanation:
- Population estimates are highly speculative the further back in time you go, especially for pre-modern periods, and the exact numbers are subject to scholarly debate.
- Major events like pandemics, wars, and the development of agriculture and technology caused fluctuations in population growth rates.
- Population growth began to accelerate more significantly with industrialization, medical advancements, and improved agricultural techniques in the last few centuries.

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