In 1871, the British North America Act called for censuses to occur every 10 years. In order to track the high rates of population growth in western Canada, the Canadian government called for a special census of the prairie provinces (Manitoba, and the two newly created provinces of Saskatchewan, and Alberta). This endeavour continued every 10 years from 1906 to 1956, at which time the Census of the Northwest Provinces became part of the Canada-wide census.
Census returns after 1916 are closed under the Statistics Act and the Act to Amend the Statistics Act. Legislation does not permit the disclosure of personal information until 92 years has passed since the time of enumeration. So the next Canada Wide census done in 1921 will not be released until 2013.
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