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| 29 | ||
| 22 | ||
| 11 | ||
| 10 | ||
| 5 | ||
| 4 | ||
| 4 | ||
| 2 | ||
| 2 | ||
| 2 | ||
| 1 | ||
| 1 | ||
| 1 |
| 18 | ||
| 9 | ||
| 7 | ||
| 5 | ||
| 5 | ||
| 4 | ||
| 3 | ||
| 3 | ||
| 2 | ||
| 2 | ||
| 2 | ||
| 2 | ||
| 1 | ||
| 1 | ||
| 1 | ||
| 1 | ||
| 1 |
| 2 | 1 | 1 | 16 | 19 | 10 | 7 | 6 | 1 | 2 | 5 |
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| 6 | 7 | 8 | 10 | 6 | 7 | 3 | 4 | 3 | 3 | 10 | 3 |
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| SPRING | 24 | |
| FALL | 16 | |
| WINTER | 16 | |
| SUMMER | 13 |
| United States | 22 | |
| Russia | 7 | |
| Canada | 3 | |
| Svalbard and Jan Mayen | 3 | |
| Antarctica | 1 | |
| Italy | 1 | |
| Kazakhstan | 1 | |
| Norway | 1 | |
| Peru | 1 |
Observations from Members