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| Year | Total cases | Cases in September | Student cases | Median age | Male:Female |
| 2007 | 1649 | 984 | 702 | 25 years | 1.99∶1 |
| 2008 | 122 | 31 | 38 | 30 years | 1.44∶1 |
| 2009 | 96 | 8 | 20 | 27 years | 2.10∶1 |
| 2010 | 2409 | 2118 | 1690 | 16 years | 1.69∶1 |
