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Population trends, age structure.
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What is age structure? age structure pyramids serve as a means of being used to determine or project the size of a population that is referring to the number of individuals of males and females who will make up the population within a given time or time.
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Frame or within a specific year.
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Now as an example, in examining the age structure, that is the trends for the country of mexico, we could begin by examining what it is rather the numbers for males and females for the year 1990.
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Now to begin, the first three bars, the bottom of the pyramid, the base bars, one here, this one, and this one going all the way across, so we're examining both males and females.
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We see that they make up majority of the population for the year 1990.
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So how old are these people? well, the base bar, most of them, are actually zero to four years old.
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So babies or toddlers, the bar above that is five to nine years of age, and the third one from the bottom is 10 to 14.
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So this population for the year 1990, most of them are younger ones.
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They are in their childhood.
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If we do a fast forward, so we're going to take these three sets of males and these three sets of females.
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And let's move to the year 2015.
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Now, from 1990 to 2015, how old would these people be? so 1990 to 2010 and then 2000 to 2015.
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So they would be 25 years old, most of them, 24.
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25, maybe 26.
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Now, these three who were at the bottom of the graph for 1990, they have shifted to about, we're going to have to mark them.
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They have shifted to about these three here for the year 2015.
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So no, they've grown up there, no, most of them, 25 through 29, 30 through 34 and 35 through 39 based on the ages that they were in the year 1990.
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So this is where they have shifted.
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Now one particular thing about this graph, comparing it to the one above, is that we see the middle portion of the year 1990 was not as large, it wasn't as large.
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As the year 2015.
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So there are more people here in this segment of the pyramid for the year 2015 than there were people there in the year 1990.
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So what does this say? essentially the population has grown.
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So let us do a marking.
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We can determine that population has grown.
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So population size increased.
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All right, which makes sense because we see that trend based on the numbers, these bars reach a farther distance.
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So whereas in 1990, there were roughly, let's see, there were roughly, 2 .5 million, 3 million, maybe 4 million don't hear when we get to 2015.
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We're starting, we're starting at 4 million.
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So 4 million, some are about 4 .4 or 4 .5, some of them are 5 million or maybe 5 .2 million...