| Country | Count | Mean |
|---|---|---|
| United States | 40 | 9.23 |
| Australia | 32 | 8.60 |
| Austria | 19 | 9.28 |
| United Kingdom | 17 | 9.19 |
| Canada | 11 | 7.73 |
| Finland | 4 | 8.63 |
| Germany | 4 | 7.58 |
| Italy | 3 | 7.70 |
| Netherlands | 2 | 7.45 |
| Thailand | 1 | 8.50 |
| Norway | 1 | 8.40 |
| Spain | 1 | 6.00 |
| Virgin Islands | 1 | 8.00 |
| Sweden | 1 | 7.50 |
| Denmark | 1 | 10.00 |
| Japan | 1 | 10.00 |
| France | 1 | 10.00 |
| Estonia | 1 | 10.00 |
| Brazil | 1 | 10.00 |
| Greece | 1 | 9.00 |