The country with the sharpest population decline in the world is China, with a decrease of more than 3 million people in the 1-year period up to July 1, 7.
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The reason for China's population decline, as well as that of other countries with strong population declines, is mainly due to natural factors, that is, the number of people born is less than the number of people dying. Specifically, in China, within 1 year up to July 1, 7, there were 2024 people born while 8.822.056 died, leading to a natural population decrease of 11.678.348 people. With nearly 2.856.292 net migrants leaving China, the country has lost more than 300 million people in 3 year, to 1 as of July 1.419.321.278, 1.
While the low birth rate policy is the main cause of natural population decline in China, in the remaining countries, the cause of natural population decline is due to old population and high standards of living. High standards of living often make people reluctant to have children or delay childbearing, both of which lead to low birth rates.
At the same time, Russia is the country with the second largest population decline in the world, with a decrease of more than 770 thousand people, down to 144.820.423. Next is Japan, down 636.276 people to 123.753.041…

Top 10 countries with the fastest population decline in the world
| Class | Country / Territory | Population in 2024 | Natural change | Change from 1 year ago | Number of births | Number of deaths | Average age |
| 1 | Chinese | 1.419.321.278 | -2.856.292 | -3.175.283 | 8.822.056 | 11.678.348 | 39,6 |
| 2 | Russia | 144.820.423 | -592.272 | -770.316 | 1.270.354 | 1.862.626 | 39,9 |
| 3 | Japanese | 123.753.041 | -789.635 | -636.276 | 750.570 | 1.540.205 | 49,4 |
| 4 | Poland | 38.539.201 | -107.006 | -345.074 | 309.612 | 416.618 | 41,8 |
| 5 | Germany | 84.552.242 | -323.591 | -286.642 | 717.268 | 1.040.859 | 45,3 |
| 6 | Italy | 59.342.867 | -279.791 | -184.548 | 384.703 | 664.494 | 47,8 |
| 7 | Greek | 10.047.817 | -54.635 | -177.409 | 71.411 | 126.046 | 46,3 |
| 8 | Czech | 10.735.859 | -25.221 | -111.390 | 90.211 | 115.432 | 43,2 |
| 9 | Romania | 19.015.088 | -77.043 | -105.500 | 180.942 | 257.985 | 42,9 |
| 10 | Taiwan (China) | 23.213.962 | -74.825 | -100.652 | 128.597 | 203.422 | 44,2 |