| Country | Count | Mean |
|---|---|---|
| Australia | 17 | 7.75 |
| United States | 17 | 8.24 |
| United Kingdom | 10 | 7.61 |
| Canada | 5 | 9.02 |
| Germany | 3 | 8.67 |
| Greece | 2 | 8.50 |
| Finland | 2 | 8.95 |
| Austria | 2 | 10.00 |
| Sweden | 1 | 7.50 |
| Brazil | 1 | 8.00 |
| Thailand | 1 | 8.00 |
| Czech Republic | 1 | 9.00 |
| Italy | 1 | 9.40 |
| France | 1 | 9.00 |
| Belgium | 1 | 9.00 |