Source
European Monitoring Centre on Drugs and Drug Addiction, "Statistical Bulletin 2013. Table GPS-2 General Population Surveys: Data Tables" (Lisbon, Portugal: EMCDDA, 2013).
European Monitoring Centre on Drugs and Drug Addiction, "Statistical Bulletin 2013. Table GPS-2 General Population Surveys: Data Tables" (Lisbon, Portugal: EMCDDA, 2013).