| N | α | μ | γ | |
|---|---|---|---|---|
| World | 7.7 × 109 | 15050 | 1.25 × 10−5 | 0.0232 |
| US | 3.4 × 108 | 5857.8 | 7.84 × 10−5 | 0.0107 |
| Canada | 3.7 × 107 | 13165 | 3.48 × 10−5 | 0.0345 |
| Russia | 1.5 × 108 | 3448.8 | 6.43 × 10−5 | 0.0278 |
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