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This is a list of the annual prevalence of cannabis use by country (including some territories) as a percentage of the population aged 15–64 (unless otherwise indicated). The indicator is an "annual prevalence" rate which is the percentage of the youth and adult population who have consumed the herb at least once in the past survey year.
Table
The primary source of information is the World Drug Report 2011 (WDR 2011), some older numbers are from the World Drug Report 2006 (WDR 2006), published by the United Nations Office on Drugs and Crime (UNODC).
References
Annual cannabis use by country Wikipedia(Text) CC BY-SA