| Country | Count | Mean |
|---|---|---|
| United States | 46 | 7.56 |
| United Kingdom | 46 | 8.12 |
| Australia | 22 | 7.34 |
| Canada | 7 | 7.11 |
| Germany | 6 | 5.42 |
| Finland | 5 | 8.22 |
| Sweden | 5 | 7.90 |
| Austria | 2 | 7.50 |
| France | 2 | 7.90 |
| Italy | 2 | 7.30 |
| Norway | 2 | 6.75 |
| Hungary | 1 | 8.00 |
| Portugal | 1 | 7.70 |
| Netherlands | 1 | 8.60 |
| Bulgaria | 1 | 9.00 |
| Estonia | 1 | 9.00 |
| Belgium | 1 | 8.00 |