| Year | Total (n = 12666) | Positive | PC | OP | HP | Range | M/F |
|---|---|---|---|---|---|---|---|
| 2006 | 2794 | 3 | 1 | 1 (33.33%) | 1 (33.33%) | 1 (33.33%) | 2/1 |
| 2007 | 3094 | 15 | 9 (60%) | 3 (20%) | 3 (20%) | 14–52 | 11/4 |
| 2008 | 3235 | 32 | 18 (56.25%) | 12 (37.50%) | 2 (6.25%) | 16–46 | 10/22 |
| 2009 | 3543 | 17 | 7 (41%) | 9 (53%) | 1 (6%) | 20–29 | 17/0 |
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