Month Persons 1968-01-01 10000 1968-02-01 10000 1968-03-01 10000 1968-04-01 10000 1968-05-01 10000 1968-06-01 10000 1968-07-01 10000 1968-08-01 10000 1968-09-01 10000 1968-10-01 10000 1968-11-01 10000 1968-12-01 10000 1969-01-01 10000 1969-02-01 10000 1969-03-01 20000 1969-04-01 10000 1969-05-01 0 1969-06-01 10000 1969-07-01 0 1969-08-01 10000 1969-09-01 10000 1969-10-01 20000 1969-11-01 10000 1969-12-01 10000 1970-01-01 10000 1970-02-01 10000 1970-03-01 10000 1970-04-01 10000 1970-05-01 0 1970-06-01 0 1970-07-01 10000 1970-08-01 10000 1970-09-01 10000 1970-10-01 0 1970-11-01 0 1970-12-01 10000 1971-01-01 10000 1971-02-01 10000 1971-03-01 10000 1971-04-01 10000 1971-05-01 10000 1971-06-01 10000 1971-07-01 10000 1971-08-01 10000 1971-09-01 10000 1971-10-01 10000 1971-11-01 10000 1971-12-01 10000 1972-01-01 10000 1972-02-01 10000 1972-03-01 50000 1972-04-01 60000 1972-05-01 20000 1972-06-01 10000 1972-07-01 10000 1972-08-01 0 1972-09-01 10000 1972-10-01 10000 1972-11-01 10000 1972-12-01 10000 1973-01-01 20000 1973-02-01 20000 1973-03-01 30000 1973-04-01 20000 1973-05-01 10000 1973-06-01 10000 1973-07-01 10000 1973-08-01 10000 1973-09-01 10000 1973-10-01 10000 1973-11-01 20000 1973-12-01 20000 1974-01-01 10000 1974-02-01 20000 1974-03-01 20000 1974-04-01 10000 1974-05-01 10000 1974-06-01 10000 1974-07-01 10000 1974-08-01 20000 1974-09-01 10000 1974-10-01 10000 1974-11-01 10000 1974-12-01 20000 1975-01-01 20000 1975-02-01 20000 1975-03-01 40000 1975-04-01 30000 1975-05-01 30000 1975-06-01 20000 1975-07-01 20000 1975-08-01 30000 1975-09-01 20000 1975-10-01 20000 1975-11-01 30000 1975-12-01 30000 1976-01-01 30000 1976-02-01 30000 1976-03-01 20000 1976-04-01 30000 1976-05-01 20000 1976-06-01 30000 1976-07-01 40000 1976-08-01 20000 1976-09-01 20000 1976-10-01 20000 1976-11-01 20000 1976-12-01 30000 1977-01-01 10000 1977-02-01 20000 1977-03-01 30000 1977-04-01 20000 1977-05-01 30000 1977-06-01 30000 1977-07-01 20000 1977-08-01 30000 1977-09-01 20000 1977-10-01 30000 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