▲ → ▼ in a century. What happens? To the economy, culture, technology?
In these population pyramids, the horizontal axis is the population count of males (left half) and females (right half) for each age between 0 to 100 years old (vertical axis). The order of these plots is from the most populous (top left) to least populous (bottom right) countries based on the year 2000. The data is from The U.S. Census Bureau's International Database: World Population Estimates and Projections.
