This is an example of a population profile or population pyramid. These types of graphs show the data two variables on a bar chart that is shifted vertically. This can show the reader any sudden increase or generally level conditions. If the bar charts have any inconsistency then the read will notice it and take note. The example below shows the different patterns that populations of different countries might have. Like a rapid growth for Kenya which currently has over half of its population percentage under 20 years old. The United States has a much more stable growth or a slower growth, much of the population ages 60 to 40 year the post WW2 Baby Boomers. The graph of Germany shows an older population with no signs of increased growth ahead. This could be the cause of slowing down of birth rates or even more migration out of the country.
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