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Subdecks (6)

factors affecting population size
birth rate
death rate
migration
life expectancy
fertility rates
key demographic changes in uk 1901 - 2013 
birth rate declined from 29 to 12 per 1000
TFR from 3.5 to 1.94
death rate from 18.4 to 9.1 per 1000
life expectancy from 45 to 78.7 for men and 82.6 for women
general fertility rate 
number of live births per 1000 women of childbearing age (15 - 44)
total fertility rate 
average number of children women will have during childbearing years