Boston's Current Population: the Indications of Several Data Sources. (Draft)

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From the recorded deaths and estimated births to nonwhites, the 1972 nonwhite population was estimated using the ratios method again, based on crude birth and death rates (CBR and CDR) which are the number of vital events occurring in a year per 1,000 persons.
The 1972 crude rates which are the basis for the population estimate were assumed to be in line with the 1966-1970 downward trend in the CDR and CBR. The method- ology employed to determine these rates is shown in Table 5.
3 . Results Tab
...les 1 through 4 show the results of calculations based on school enrollments. School enrollment data indicate a population loss to Boston of 6.7 percent or 43,000 during the - 10 - three and a half year period following the 1970 Census.
This loss of approximately two percent a year is double the average annual population loss of the 1960-70 decade.
On the other hand, nonwhites increased by some 5.4 percent , approximately 6,000 persons from 116,073 to 122,588 persons.
Their numerical increase slowed to 37 percent of the increase for a comparable period during the 1960s.


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