| Europe (Number) |
| Italy | 144 in 2014 | UNODC |
| Belgium | 40 in 2011 | UNODC |
| Albania | 38 in 2015 | UNODC |
| Sweden | 31 in 2015 | UNODC |
| Spain | 30 in 2015 | UNODC |
| Netherlands | 26 in 2015 | UNODC |
| Bosnia and Herzegovina | 25 in 2015 | UNODC |
| Greece | 25 in 2014 | UNODC |
| Bulgaria | 15 in 2014 | UNODC |
| Ireland | 15 in 2012 | UNODC |
| North Macedonia | 15 in 2014 | UNODC |
| Belarus | 14 in 2014 | UNODC |
| Lithuania | 11 in 2015 | UNODC |
| Portugal | 11 in 2014 | UNODC |
| Denmark | 10 in 2011 | UNODC |
| Serbia | 10 in 2015 | UNODC |
| Slovakia | 10 in 2014 | UNODC |
| Montenegro | 9 in 2015 | UNODC |
| Poland | 7 in 2015 | UNODC |
| Switzerland | 7 in 2017 | UNODC |
| Austria | 5 in 2015 | UNODC |
| Czech Republic | 5 in 2017 | UNODC |
| Norway | 5 in 2014 | UNODC |
| Republic of Moldova | 4 in 2014 | UNODC |
| Croatia | 3 in 2015 | UNODC |
| Latvia | 3 in 2015 | UNODC |
| Romania | 3 in 2015 | UNODC |
| Slovenia | 3 in 2014 | UNODC |
| Finland | 2 in 2016 | UNODC |
| Malta | 2 in 2015 | UNODC |
| United Kingdom | 2 in 2013 | UNODC |
| Estonia | 1 in 2014 | UNODC |
| Hungary | 1 in 2014 | UNODC |
| Iceland | 1 in 2010 | UNODC |
| Luxembourg | 1 in 2014 | UNODC |
| Andorra | 0 in 2008 | UNODC |
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