| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 122 |
8.1%
|
|
| 2007 | 219 |
14.5%
|
|
| 2008 | 326 |
21.6%
|
|
| 2009 | 359 |
23.8%
|
|
| 2010 | 354 |
23.4%
|
|
| 2011 | 131 |
8.7%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 411 |