European Monitoring Centre for Drugs and Drug Addiction
EMCDDA Statistical bulletin 2006
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Figure PPP-1: Average potency of cannabis resin at retail level measured as percentage of THC content, 1999 to 2004
Figure PPP-2: Average potency of herbal cannabis at retail level measured as percentage of THC content, 1999 to 2004
Figure PPP-3: Indexed trends in EU retail prices for major drug types, adjusting for inflation, 1999 to 2004