Table 2.
Potency of cannabis resin and herbal cannabis in Europe, 2006–16. Data show mean [± 95% confidence intervals (CIs)] concentrations of Δ9‐tetrahydrocannabinol (THC) (%).
| Cannabis resin | Herbal cannabis | |||
|---|---|---|---|---|
| Mean | (95% CI) | Mean | (95% CI) | |
| 2006 | 8.14 | (6.89, 9.49) | 5.00 | (3.91, 6.23) |
| 2007 | 8.08 | (6.95, 9.25) | 5.52 | (4.38, 6.80) |
| 2008 | 8.23 | (6.98, 9.51) | 6.05 | (4.95, 7.30) |
| 2009 | 8.60 | (7.28, 9.95) | 6.57 | (5.58, 7.65) |
| 2010 | 9.18 | (7.96, 10.49) | 7.09 | (6.03, 8.24) |
| 2011 | 9.98 | (8.67, 11.31) | 7.61 | (6.56, 8.74) |
| 2012 | 11.00 | (9.52, 12.53) | 8.13 | (7.07, 9.23) |
| 2013 | 12.23 | (10.59, 13.92) | 8.66 | (7.65, 9.68) |
| 2014 | 13.68 | (11.96, 15.44) | 9.18 | (7.93, 10.43) |
| 2015 | 15.34 | (13.45, 17.40) | 9.70 | (8.43, 11.01) |
| 2016 | 17.22 | (15.23, 19.25) | 10.22 | (9.01, 11.47) |