Demography

What is Demography?

Demography is the study of: 1.Populations2.Population density3.Historical Trends in Population Growth

Birth RateIt is not the number of births that matter but the relationship between the number of births and the size of population

Birth Rate (b) is the number of births for every 1000 people

In Canada this is 10 births for every 1000 people

Death Rate

The Death Rate (d) calculates the number of deaths per year for every 1000 peopleIn Canada this number is about 7 per year

for every 1000

The Rate of Natural Increase

The birth and death rate can be put into a useful measurement called the natural rate of increaseBirth rate (b) − death rate (d) =

rate of natural increase (r).

− ＝ ⬆

Let’s Practice...Calculating Birth

Rate:

Country# of Births Per

year Population Birth Rate

Canada 330, 000 32, 207, 000

Russia 1,458,000144, 526,

000

Togo 191, 000 5, 429, 000A country’s birth rate is calculated by dividing the number of births in one year by the population and

then multiplying the results by 1000

Let’s Practice...Calculating Death

Rate:

Country# of Deaths per

yearPopulation

Death Rate

Canada 226 169 32 207 000

Russia 2 365 826 144 526 000

Togo 62 433 5 429 000

A country’s death rate is calculated by dividing the number of deaths in one year by the population and

then multiplying the results by 1000

Let’s Practice...Calculating the Natural Rate of

Increase:

CountryBirth Rate

Death Rate

Natural Rate of Increase

Canada 10/1000 7/1000

Russia 10/1000 16/1000

Togo 35/1000 11/1000

*Why is it important for a country to know what their Natural Rate of Increase is?

Net Migration RateImmigration and Emigration rates are

calculated in the same manner as birth and death rateNet Migration Rate = Immigration

Rate -Emigration rate

Let’s Practice...

Year Immigration Rate Emigration RateNet

Migration

2002 134282/31,372,600 x 1000

12,601/31,372,600x 1000

2003 104248/31,660,500 x 1000

12,663/ 31,660,500 x 1000

Statistics for Canada

*Remember Net Migration Rate is immigration rate - emigration rate

Population Growth Rate…is a measurement that combines both natural increase

and net migration to calculate the overall growth ofa country’s population.

To calculate: Population Growth Rate = natural increase rate +

net immigration rate/1000 x 100 (%)

Compounding

Doubling Time - is the time it would take for a country’s population to double at the country’s current rate of population growthRule of 70 - is when you divide 70

by the population growth rate to estimate how many years it will take for the country’s population to double

Let’s Practice...Calculate Doubling

Time:

Country70/population growth rate

Doubling Time

Canada 70 / 0.8%

Togo 70 / 2.4%

Homework1.Read pages 186 – 1902.Answer the following questions on page

194A.Knowledge # 1 – 2B.Thinking # 3 - 4