| Country | Count | Mean |
|---|---|---|
| United States | 30 | 8.74 |
| Australia | 25 | 8.77 |
| United Kingdom | 19 | 8.22 |
| Canada | 9 | 8.99 |
| Germany | 4 | 8.25 |
| Austria | 3 | 9.67 |
| Sweden | 2 | 8.00 |
| Finland | 2 | 8.95 |
| Norway | 2 | 9.20 |
| Greece | 2 | 9.50 |
| Estonia | 1 | 8.00 |
| Portugal | 1 | 7.70 |
| Netherlands | 1 | 10.00 |
| Bulgaria | 1 | 10.00 |
| France | 1 | 10.00 |
| Czech Republic | 1 | 9.00 |
| Italy | 1 | 9.30 |