国別シェア
| 国 | 量 | 企業 |
|---|---|---|
| United States | 29 |
|
| Australia | 1 |
|
| United Kingdom | 3 |
|
| France | 1 |
|
| Brazil | 1 |
|
| Canada | 5 |
|
| Japan | 3 |
|
| Norway | 1 |
|
| Italy | 1 |
|
| Chile | 1 |
|
| Kazakhstan | 1 |
|
| China | 1 |
|
| Colombia | 1 |
|
| Russia | 2 |
|
