| United States | 25 |
| Italy | 15 |
| Belgium | 11 |
| France | 10 |
| United Kingdom | 8 |
| Germany | 6 |
| Australia | 5 |
| New Zealand | 5 |
| Spain | 5 |
| Ireland | 4 |
| Japan | 4 |
| Turkey | 4 |
| Austria | 3 |
| Bulgaria | 3 |
| Canada | 3 |
| Israel | 2 |
| Netherlands | 2 |
| Argentina | 1 |
| Austria–Hungary | 1 |
| Brazil | 1 |
| British Raj | 1 |
| Chile | 1 |
| Empire of Japan | 1 |
| French Indochina | 1 |
| German Reich | 1 |
| Haiti | 1 |
| Hungary | 1 |
| Kazakhstan | 1 |
| Kingdom of Italy | 1 |
| People's Republic of China | 1 |
| Portugal | 1 |
| Qatar | 1 |
| Qing dynasty | 1 |
| Saudi Arabia | 1 |
| Serbia | 1 |
| South Korea | 1 |
| Ukraine | 1 |
| United Arab Emirates | 1 |