The figure below shows the age structures for the world human population in 1950 and 2010 as well as a projection for the year 2100. How did the age structure of the world population change between 1950 and 2010? How is it expected to change between 2010 and 2100?

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World 1950 World 2010 World 2100 105 100 105 100 105 100 90 90 90 Males Females 80 80 80 70 70 70 60 60 60 50 50 50 40 40 40 30 30 30 20 20 20 10 10 10 0 0 0 300 200 100 0 100 200 300 300 200 100 0 100 200 300 300 200 100 0 100 200 300 (millions)