| 79 | United States | |
| 12 | ||
| 10 | China | |
| 5 | Japan | |
| 3 | Germany | |
| 2 | United Kingdom | |
| 2 | Russian Federation | |
| 1 | Korea, Republic of | |
| 1 | Canada | |
| 1 | South Africa | |
| 1 | Spain | |
| 1 | Algeria | |
| 1 | Philippines | |
| 1 | Turkey | |
| 1 | Lithuania | |
| 1 | Thailand | |
| 1 | Ukraine | |
| 1 | Australia | |
| 1 | India | |
| 1 | Tanzania, United Republic of |