| Country | Count | Mean |
|---|---|---|
| United States | 42 | 7.92 |
| United Kingdom | 40 | 8.25 |
| Australia | 33 | 7.67 |
| Canada | 8 | 6.88 |
| Germany | 5 | 5.26 |
| Norway | 2 | 6.20 |
| Austria | 2 | 7.40 |
| Ireland | 2 | 5.60 |
| France | 2 | 1.50 |
| Greece | 2 | 6.50 |
| Czech Republic | 1 | 3.00 |
| Sweden | 1 | 6.00 |
| Portugal | 1 | 7.70 |
| Finland | 1 | 8.80 |
| Hungary | 1 | 10.00 |
| Chad | 1 | 10.00 |
| Bulgaria | 1 | 10.00 |
| Netherlands | 1 | 10.00 |
| Italy | 1 | 8.50 |
| Estonia | 1 | 10.00 |
| Spain | 1 | 8.00 |