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Population Formulas – Compare Trends. An example… ► Let’s say a country has a population of...

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Population Formulas Population Formulas – Compare Trends – Compare Trends
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Population Formulas – Population Formulas – Compare TrendsCompare Trends

An example…An example…

►LetLet’’s say a country has a population of s say a country has a population of 30,000,000.30,000,000. Births = 390,000Births = 390,000 immigrants = immigrants =

220,000220,000 Deaths = 210,000Deaths = 210,000 emigrants = emigrants =

60,00060,000

►How can we figure out how fast their How can we figure out how fast their population is growing???population is growing???

►Birth RateBirth Rate – – the number of people born per yearthe number of people born per year x x 1000 1000 population population

For example:For example:

BR = BR = 390,000 390,000 x 1000 x 1000 30,000,00030,000,000

BR = 13 (this country had 13 people born per BR = 13 (this country had 13 people born per 1,000 people in that country) 1,000 people in that country)

►Death RateDeath Rate – – the number of deaths per yearthe number of deaths per year x x 10001000

populationpopulation

For example:For example:

DR = DR = 210,000 210,000 x 1000 x 1000 30,000,00030,000,000

DR = 7 (this country had 7 people die per DR = 7 (this country had 7 people die per 1,000 people in that country) 1,000 people in that country)

►Natural Increase RateNatural Increase Rate = birth rate – death = birth rate – death raterate

Example:Example:

13 – 7 = 6 13 – 7 = 6 (per 1000)(per 1000)

This means that the natural increase rate This means that the natural increase rate for this country is 6 people per 1000for this country is 6 people per 1000

►Immigration RateImmigration Rate

the number of immigrants per yearthe number of immigrants per year x 1000 x 1000 populationpopulation

For example:For example:

IR = IR = 220,000 220,000 x 1000 x 1000 30,000,00030,000,000

IR = 7 (this country had 7 people immigrate per IR = 7 (this country had 7 people immigrate per 1,000 people in that country) 1,000 people in that country)

►Emigration RateEmigration Rate

the number of emigrants per yearthe number of emigrants per year x 1000 x 1000 populationpopulation

For example:For example:

ER = ER = 60,000 60,000 x 1000 x 1000 30,000,00030,000,000

ER = 2 (this country had 2 people emigrate per ER = 2 (this country had 2 people emigrate per 1,000 people in that country) 1,000 people in that country)

► Net Migration RateNet Migration Rate = = Immigration Rate – Immigration Rate – Emigration RateEmigration Rate

Example:Example:

7 – 2 = 5 7 – 2 = 5 (per 1000)(per 1000)

This means that the net migration rate for This means that the net migration rate for this country is 5 people per 1000this country is 5 people per 1000

► Population Growth RatePopulation Growth Rate = =

Natural Increase Rate + Net Migration RateNatural Increase Rate + Net Migration Rate

Example:Example:

6 + 5 = 11 6 + 5 = 11 (per 1000)(per 1000)

This country is growing at a rate of 11 This country is growing at a rate of 11 people per 1000.people per 1000.

►Always express the population Always express the population growth rate as a percent!!growth rate as a percent!!

11 11 X 100 = 1.1 % X 100 = 1.1 %

10001000

Or you can simply move the Or you can simply move the decimal one spot to the left.decimal one spot to the left.

►The Rule of 70 (Doubling Time)The Rule of 70 (Doubling Time)

70 70 Population Growth Rate (as a percent)Population Growth Rate (as a percent)

70 70 = 63.6 years = 63.6 years 1.11.1

What this tells us is that the population of What this tells us is that the population of that country will double in that country will double in 63.6 years63.6 years..

►Example – The African country of Example – The African country of TogoTogo

Togo has a population growth rate of 3.6%Togo has a population growth rate of 3.6%

70 70 = 19.4 years = 19.4 years 3.63.6

The population of Togo will double in under 20 The population of Togo will double in under 20 years.years.

Time to practice….Time to practice….

►A country has a population of A country has a population of 1,807,242.1,807,242. Births = 50,250Births = 50,250 immigrants = immigrants =

13,60513,605 Deaths = 42,658Deaths = 42,658 emigrants = emigrants =

11,50011,500

►Do all the calculations (just like in the Do all the calculations (just like in the example we did)example we did)

AnswersAnswers► Birth rate = 27.8 per 1,000Birth rate = 27.8 per 1,000►Death rate = 23.6 per 1,000Death rate = 23.6 per 1,000►Natural increase rate = 4.2 per 1,000Natural increase rate = 4.2 per 1,000

► Immigration rate = 7.5 per 1,000Immigration rate = 7.5 per 1,000► Emigration rate = 6.4 per 1,000Emigration rate = 6.4 per 1,000►Net Migration rate = 1.1Net Migration rate = 1.1

► Population Growth rate (%) = 5.3 Population Growth rate (%) = 5.3 = = 0.53%0.53%

►Doubling Time = 132.1 yearsDoubling Time = 132.1 years

Another practice question….Another practice question….

►A country has a population of 726,000A country has a population of 726,000 Births = 12,500Births = 12,500 immigrants = immigrants =

3,6053,605 Deaths = 6,100Deaths = 6,100 emigrants = emigrants =

1,5001,500

►Do all the calculations (just like in the Do all the calculations (just like in the example we did)example we did)

AnswersAnswers► Birth rate = 17.2 per 1,000Birth rate = 17.2 per 1,000►Death rate = 8.4 per 1,000Death rate = 8.4 per 1,000►Natural increase rate = 8.8 per 1,000Natural increase rate = 8.8 per 1,000

► Immigration rate = 5 per 1,000Immigration rate = 5 per 1,000► Emigration rate = 2.1 per 1,000Emigration rate = 2.1 per 1,000►Net Migration rate = 2.9Net Migration rate = 2.9

► Population Growth rate (%) = 11.7 Population Growth rate (%) = 11.7 = = 1.17%1.17%

►Doubling Time = 60 yearsDoubling Time = 60 years

Homework question….Homework question….

►A country has a population of A country has a population of 8,000,0008,000,000 Births = 200,000Births = 200,000 immigrants = immigrants =

125,000125,000 Deaths = 40,000Deaths = 40,000 emigrants = emigrants =

30,00030,000

►Do all the calculations.Do all the calculations.

Homework AnswersHomework Answers► Birth rate = 25 per 1,000Birth rate = 25 per 1,000►Death rate = 7.3 per 1,000Death rate = 7.3 per 1,000►Natural increase rate = 17.7 per 1,000Natural increase rate = 17.7 per 1,000

► Immigration rate = 1.25 per 1,000Immigration rate = 1.25 per 1,000► Emigration rate = 1.5 per 1,000Emigration rate = 1.5 per 1,000►Net Migration rate = 0.25Net Migration rate = 0.25

► Population Growth rate (%) = 17.0 = Population Growth rate (%) = 17.0 = 1.7%1.7%

►Doubling Time = 41 yearsDoubling Time = 41 years

The end….The end….


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