POPULATION PYRAMIDS.

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The Population Pyramid

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Presentation transcript:

POPULATION PYRAMIDS

Objectives WHAT is a population pyramid? HOW to read a population pyramid? Recognise SHAPES of population pyramids. IMPORTANCE of population pyramids.

What is a population pyramid? It is a diagram that gives information about the proportion of males and females in each age group. Also shows: - proportion of young people (0 -14 ) - proportion of working people (15 – 59) - proportion of elderly people (60+)

What is a population pyramid? Vertical Axis - Age Groups Elderly dependents Working population Young dependents Horizontal Axis – Percentage / number

How to read a population pyramid? Read the title e.g. country or city or racial group Comment on general shape of the pyramid Note the proportion of people in various age groups Note the sex ratio Interpret the data

Types of Population Pyramid Expansive: rapid growth Stationary: slow/stable growth Constrictive: negative growth Shape of pyramids is controlled by births, deaths, & migrations.

Expansive Pyramid (Triangular Shaped Pyramid)

Expansive Pyramid Title: India, 2000 Shape: Broad Base - high birth rates Narrow Top - small elderly pop - high death rate Proportion: Large proportion of young Sex Ratio: Balanced sex ratio

Indonesia 2000 Malaysia 2000

Stationary Pyramid

Stationary Pyramid Title: Netherlands, 2000 Shape: Straight shape 14 yrs – 0 yrs Slow or no Population Growth - Low Birth Rates - Life-expectancy is high - Low death rates Proportion: Bars of equal length - Balance Proportion Sex Ratio: Balanced Sex Ratio

Netherlands 2000

Constrictive Pyramid

Constrictive Pyramid Title: Hong Kong, 2000 Shape: Rocket-shaped / Narrow Base – Low Birth Rates, Slow pop growth Proportion: Large proportion of working population, 15-59 yr old - large group of economically active pop Sex Ratio: Balanced pyramid

Hong Kong 2000

Expansive Stationary Constrictive

Each pyramid tells a story about the past, present & future of a country & its people.

Importance of Population Pyramids Policy Planning ~ future housing estates ~ future schools ~ future jobs ~ future infrastructure Comparison with other countries ~ developed (US) vs developing (India)