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Lecture

GGR100H1 Lecture Notes - Global City


Department
Geography
Course Code
GGR100H1
Professor
liafriedricksen

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CALCULATING)POPULATION)GROWTH)
GGR#216#Global#Cities#
Summer#2012#
#
Calculating#the#percent#change#in#population#is#an#important#tool#for#understanding#how#
much#a#city’s#population#has#grown#or#declined#from#one#point#in#time#to#another.##
Using#past#and#current#population#figures#tells#us#about#historical#growth.##Using#current#
figures#and#projected#figures#tells#us#how#much#a#city’s#population#is#forecasted#to#grow#
from#now#to#a#point#in#time#in#the#future.##Knowing#how#to#calculate#this#figure#is#a#
useful#skill#for#the#study#of#urbanization.###
#
To#calculate#percent#growth#in#population,#you#need#the#past#total#population#(V"past)#
and#the#present#total#population#number#(V"present).#
#
#
Calculate:# # 𝑽!𝒑𝒂𝒔𝒕!𝑽!𝒑𝒓𝒆𝒔𝒆𝒏𝒕
𝑽!𝒑𝒓𝒆𝒔𝒆𝒏𝒕
×!𝟏𝟎𝟎 =𝑷𝒆𝒓𝒄𝒆𝒏𝒕!𝑪𝒉𝒂𝒏𝒈𝒆)#
#
[Read#this#as:#past#minus#present#divided"by"present#times#100]#
#
#
To#calculate#the#annual#population#growth#rate,#simply#divide#the#percent#change#by#the#
number#of#years#in#your#data#set.##For#example,#if#your#data#is#population#between#1950#
and#1970,#you#would#divide#the#percent#change#by#20.#
#
Calculate:# # 𝑷𝒆𝒓𝒄𝒆𝒏𝒕!𝑪𝒉𝒂𝒏𝒈𝒆
𝑵𝒖𝒎𝒃𝒆𝒓!𝒐𝒇!𝒀𝒆𝒂𝒓𝒔
=𝑨𝒏𝒏𝒖𝒂𝒍!𝑷𝒆𝒓𝒄𝒆𝒏𝒕!𝑪𝒉𝒂𝒏𝒈𝒆#
#
#
An#example,#using#Toronto’s#population#from#2008#and#2011.#
#
Toronto#Population#2008:#5,#536,#800#
Toronto#Population#2011:#5,#838,#800#
#
5,536,800 5,838,800 =!
302,000
5,838,800 =!0.0517!×!100 =5.17%#
#
Annual#growth#rate,#2008#to#2011#(3#years):## #
###########!.!"
!
=1.72%!
#
So#we#would#write:#
“Toronto’s#population#grew#5.2%#between#2008#and#2011,#at#a#rate#of#1.7%#per#year.”#
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