| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 54 |
2.2%
|
|
| 2007 | 248 |
10.1%
|
|
| 2008 | 456 |
18.5%
|
|
| 2009 | 1107 |
44.9%
|
|
| 2010 | 601 |
24.4%
|
|
| Sysmiss | 8807 |