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Britain is a relatively densely populated country: it is more than twice as densely populated as France (106 people per sq.km), nine times as densely populated as the USA (27 people per sq.km) and 100 times as densely populated as Australia (2 people per sq.km).
According to a BBC Report in September 2005, immigration made up more than half of Britain's population growth from 1991 to 2001.
Britain ranks 18th in the world in terms of population size.
The population is very unequally distributed over the four parts of the UK: England more or less constantly makes up 84% of the total population, Wales around 5%, Scotland roughly 8.5 %, and Northern Ireland (since 1921) less than 3%.
Nearly 84 per cent of the total population of the United Kingdom lives in England. The most densely populated areas of England are the major cities and metropolitan areas of London and the South East, South and West Yorkshire, Greater Manchester and Merseyside, the West Midlands, and the conurbations on the rivers Tyne,Wear and Tees. London has the highest population density with 4,700 people per square kilometre, and the South West the lowest (210 people per square kilometre).
London had a far higher population density than any of the English regions, with 4,700 people living in each square kilometre on average.