Final answer:
The numbers between the bars in age-structure pyramids typically represent the percentage of the population within each age class, organized in 5-year ranges.
Step-by-step explanation:
The numbers between the bars in the age-structure pyramids represent the percentage of the population in each age class. Age-structure pyramids are graphical representations of the population's age and sex distribution where males are typically on the left and females on the right. The vertical axis is usually organized by age classes, often in 5-year ranges, while the horizontal axis represents the size of the population either as an absolute number or as a percentage of the total population.
Different shapes of these pyramids can indicate aspects of the population's growth dynamics and can be associated with the country's level of economic development. For instance, rapidly growing populations tend to have a pyramid shape due to a large base representing a high number of young individuals.
Developed countries may show a more conical age-structure, with fewer young individuals and a greater proportion of middle-aged and older individuals, correlating with slower population growth or even decline.