| Rank | Country | Production (tons) |
| 1 | Australia | 36,000 |
| 2 | Chile | 14,300 |
| 3 | Argentina | 5700 |
| 4 | China | 2000 |
| 5 | Zimbabwe | 900 |
| 6 | Portugal | 200 |
| 7 | Brazil | 200 |
|
| World | 59,300 |