| Country (Percent) |
| United States of America | 22.7 in 2014 | UNECE |
| Ireland | 8.7 in 2019 | UNECE |
| Republic of Moldova | 8.6 in 2005 | UNECE |
| Denmark | 8.1 in 2017 | UNECE |
| Malta | 6.2 in 2014 | UNECE |
| Canada | 6.1 in 2019 | UNECE |
| Hungary | 5.7 in 2019 | UNECE |
| Spain | 4.4 in 2017 | UNECE |
| Austria | 4.1 in 2019 | UNECE |
| Andorra | 4 in 2017 | UNECE |
| Sweden | 4 in 2019 | UNECE |
| France | 3.8 in 2014 | UNECE |
| Germany | 3.4 in 2017 | UNECE |
| Lithuania | 3.3 in 2019 | UNECE |
| Turkey | 3.2 in 2019 | UNECE |
| Albania | 3 in 2017 | UNECE |
| Georgia | 3 in 2013 | UNECE |
| Norway | 3 in 2019 | UNECE |
| Slovakia | 3 in 2019 | UNECE |
| Poland | 2.7 in 2014 | UNECE |
| Armenia | 2.6 in 2015 | UNECE |
| Latvia | 2.6 in 2019 | UNECE |
| Russian Federation | 2.6 in 2013 | UNECE |
| Serbia | 2.6 in 2013 | UNECE |
| Finland | 2.1 in 2014 | UNECE |
| Slovenia | 2.1 in 2019 | UNECE |
| Portugal | 2 in 2005 | UNECE |
| Belarus | 1.8 in 2019 | UNECE |
| Italy | 1.7 in 2019 | UNECE |
| Romania | 1.4 in 2014 | UNECE |
| Croatia | 1.3 in 2014 | UNECE |
| Greece | 1.3 in 2019 | UNECE |
| Belgium | 1.1 in 2013 | UNECE |
| Switzerland | 1.1 in 2017 | UNECE |
| Cyprus | 1 in 2019 | UNECE |
| Bulgaria | 0.6 in 2008 | UNECE |
| Azerbaijan | 0.2 in 2016 | UNECE |
| Kyrgyzstan | 0.1 in 2019 | UNECE |
| Ukraine | 0.3 in 2019 | UNECE |
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