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Published byTiffany Cook Modified over 9 years ago
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Population Pyramids: Graphing Population Data by Age & Sex
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Different Ages – Different Roles
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Dependency Load Dependency Load:
% of the population under age 15 and aged 65 and over we can see a country’s dependency load by graphing the data – population pyramid
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1. Population Pyramid Allows you to graph the number of males and females in a country by age groups We can see the % of younger & older people within the population Uses horizontal bar graphs Left side of graph is always male Right side of graph is always female Use different colours for each sex
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2. Canada’s Changing Population Structure
Look at Canada’s population pyramid from 1956 Why do you think Canada had a rapid population growth during this period?
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3. Rapid Population Growth in 1950’s
Post-WWII: 1. Many immigrants coming into the country 2. People were having moderately large families 3. Canada was in the midst of a “baby boom” Babies born btw 1946 and 1961 are referred to as “baby boomers”
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4. Comparing 1956 and 2004 (pg 190) What do you notice about the size of their dependency loads? Both pyramids have high dependency loads, but since 1956… % of children decreased % of elderly increased
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5. Impact of High Dependency Load
In 1956: Emphasis on providing schools for growing number of kids In 2004: Little need for new schools, except in some new suburban areas (Some schools are even closing down) Those in gr. 1 in 1956 were now 54 yrs old Need to shift Canadian society’s focus to provide services for older population Brainstorm: How will you be affected by Canada’s dependency load (large aging population) in the future?
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What does Canada’s aging population mean for Canadian Society
What does Canada’s aging population mean for Canadian Society? Brainstorm. Part of Canadian Society How Canada’s aging population will affect it: Healthcare Housing The people available to work (the work force) Job opportunities for younger Canadians The sorts of things Canadians will want to buy
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4 Types of Population Pyramids
We can tell a lot from the shape of a population pyramid Expansive — a wide base, meaning a high proportion of children, a fast rate of population growth, and a low proportion of older people. Stable — a structure with indentations that even out and reflect slow growth over a period of time Stationary — a narrow base and roughly equal numbers in each age group, tapering off at the older ages. Declining — a high proportion of aged persons and declining numbers.
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1. Expansive (wide base) wide base: lots of children = high birth rate
high death rate fast rate of population growth Few older people
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2. Stable (wide middle) Slow growth over a period of time
High birth rate Decreasing death rate
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3. Stationary (equal numbers)
a narrowing base - fewer children = drop in birth rate roughly equal numbers in each age group, tapering off at the older ages.
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4. Declining (narrow base)
Birth rate declines to point where it’s close to death rate High number of aged people declining numbers in population
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Case Study #1 - India
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India 2005
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India 2020
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India 2050
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Case Study #2 - Japan
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Japan 2010
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Japan 2020
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Japan 2050
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Let’s look at some population pyramids!
Canada’s population 1901 – 2001 : Canada’s population projection 2056: Population pyramids of different countries:
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