Period | 1951-1980 | 1981-2010 | Total | |
Class | Moderate | 41 | 32 | 73 |
Severe | 5 | 19 | 24 | |
Extreme | 0 | 3 | 3 | |
Very extreme | 0 | 2 | 2 | |
Super extreme | 0 | 1 | 1 | |
Total | 46 | 57 | 103 |