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The Registrar-General's estimate of the midyear population
of the Borough for 1971 shows a decrease of 5,420 compared with
1970. In 1965, the estimate was 250,430 and the figure has consistently
increased each year to reach the 1970 estimate of
252,130. Movement of population away from the London area,
which has been considerable in recent years, renders accurate
estimates of population very difficult. The 1971 mid-year estimate,
being based on the provisional figures from the census taken
earlier in the year has resulted in a more accurate estimate.
The effect on statistics resulting from a 5,420 fall in the
population is noticeable in both the birth rate and the death rate,
which are included in the tables below. The number of births
increased by 99, and this higher number would have increased
the birth rate by approximately 0.4 per 1,000 population, but due
to the lower population figure, the rate increased by 0.8. Similarly,
deaths were 58 fewer in 1971 compared with 1970, and the rate
would have dropped from 11.2 to 10.9. Here the alteration in the
mid-year estimate resulted in the death rate remaining at 11.2
per 1,000 population. These rates quoted are after adjustment of
the crude rates byv the Area comparability factors of 0.92 for
births and 1.33 for deaths.