The provided table illustrates the ten most populous countries in 2019 and their projected population figures for the year 2100. Overall, it is clear that significant demographic shifts are anticipated, with India set to become the world's most populous nation, while African countries will experience substantial growth in their rankings.
In 2019, China held the top position with 1,439 million people, closely followed by India at 1,380 million. By 2100, these positions are projected to reverse, with India reaching 1,551 million and China declining to 941 million. The USA, which ranked third in 2019 with 331 million, is expected to remain in the top five, growing to 478 million by 2100, despite dropping to fourth place.
Notably, Nigeria is projected to experience a dramatic increase, rising from 206 million in 2019 to 730 million by 2100, securing the third position. Furthermore, the list will see the emergence of new entries such as the Democratic Republic of Congo, Ethiopia, and Tanzania, which are projected to reach 296 million, 212 million, and 178 million respectively. Conversely, countries like Brazil, which ranked sixth in 2019 with 213 million, will see their relative standing diminish, falling to tenth place by 2100 with 177 million.