| Country | Count | Mean |
|---|---|---|
| United States | 19 | 7.79 |
| Australia | 16 | 7.70 |
| United Kingdom | 11 | 7.53 |
| Canada | 5 | 8.64 |
| Germany | 3 | 6.33 |
| Austria | 3 | 9.67 |
| Greece | 2 | 7.00 |
| Portugal | 1 | 7.50 |
| Turkey | 1 | 7.50 |
| Sweden | 1 | 7.00 |
| Czech Republic | 1 | 9.00 |
| Romania | 1 | 10.00 |
| Italy | 1 | 8.70 |
| Croatia | 1 | 8.00 |
| Norway | 1 | 8.00 |