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THE BRITISH ISLES
II
mostly since i945> Canada, Australia, New Zealand and South Africa, and
a larger inward movement mainly of aliens from Europe, many of whom were
refugees seeking sanctuary in Britain. Taking only the period 1946-51 the balance
of migration by sea (figures for air transport are not available) was outward owing
to the high net outflow (some 65,000 a year) of British citizens to Commonwealth
countries overseas. In 1952 this net outflow reached a peak of 87,000, but it was
subsequently reduced, chiefly owing to increased immigration into Britain from
other parts of the Commonwealth, particularly the West Indies, and the net balance
of migration to and from all countries for the years 1952 to 1956 was certainly
small. In the fourth quarter of 1956 and the first half of 1957, however, there was a
marked increase in emigration to Canada. In 1957, total migratory movement
both into and out of Britain is estimated to have been very high, probably over
200,000 each way, with a slight outward balance.
Age Distribution. The first effect of the fall in the birth rate was to reduce the
number of children, and therefore the ratio of dependent population to working
PERCENTAGE CHANGE IN POPULATION SINCE 1901
BY AGE GROUP
1901 =0
— 50-1

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