| Europe (ratio) |
| Greece | 38.75 in 2017 | WB |
| Czech Republic | 26.02 in 2013 | WB |
| Serbia | 22.07 in 2018 | WB |
| France | 21.29 in 2013 | WB |
| Italy | 20.12 in 2017 | WB |
| Romania | 19.97 in 2017 | WB |
| Finland | 19.84 in 2017 | WB |
| Poland | 17.1 in 2015 | WB |
| Belgium | 16.95 in 2017 | WB |
| United Kingdom | 15.56 in 2017 | WB |
| Ireland | 15.39 in 2010 | WB |
| North Macedonia | 14.95 in 2017 | WB |
| Montenegro | 14.9 in 2018 | WB |
| Albania | 14.07 in 2018 | WB |
| Belarus | 13.86 in 2018 | WB |
| Republic of Moldova | 13.84 in 2018 | WB |
| Hungary | 13.61 in 2016 | WB |
| Slovakia | 12.79 in 2017 | WB |
| Netherlands | 12.74 in 2017 | WB |
| Sweden | 12.28 in 2017 | WB |
| Spain | 12.03 in 2017 | WB |
| Latvia | 11.81 in 2017 | WB |
| Estonia | 11.35 in 2017 | WB |
| Slovenia | 11.3 in 2016 | WB |
| Bulgaria | 11.25 in 2017 | WB |
| Portugal | 10.46 in 2017 | WB |
| Lithuania | 10.36 in 2017 | WB |
| Ukraine | 10.33 in 2018 | WB |
| Russian Federation | 9.86 in 2017 | WB |
| Croatia | 9.76 in 2016 | WB |
| Bosnia and Herzegovina | 9.37 in 2018 | WB |
| Luxembourg | 9.15 in 2016 | WB |
| Switzerland | 8.73 in 2017 | WB |
| Iceland | 8.71 in 2012 | WB |
| Norway | 8.56 in 2017 | WB |
| Denmark | 8.46 in 2015 | WB |
| Malta | 8.31 in 2017 | WB |
| Germany | 7.59 in 2017 | WB |
| Austria | 7.18 in 2017 | WB |
| Liechtenstein | 7.13 in 2017 | WB |
| Monaco | 6.88 in 2016 | WB |
| San Marino | 5.1 in 2018 | WB |
| Andorra | 4.43 in 2018 | WB |
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