| Country | Count | Mean |
|---|---|---|
| United States | 67 | 8.86 |
| United Kingdom | 50 | 9.28 |
| Australia | 35 | 8.17 |
| Canada | 10 | 7.56 |
| Germany | 6 | 7.30 |
| Sweden | 5 | 8.60 |
| France | 3 | 8.13 |
| Finland | 3 | 9.10 |
| Austria | 3 | 5.00 |
| Norway | 2 | 9.20 |
| Italy | 2 | 9.25 |
| Belgium | 2 | 8.25 |
| Estonia | 1 | 10.00 |
| Netherlands | 1 | 10.00 |
| Greece | 1 | 10.00 |
| Hungary | 1 | 10.00 |
| Bulgaria | 1 | 10.00 |
| Ireland | 1 | 9.90 |