| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 88 |
5.9%
|
|
| 2007 | 229 |
15.3%
|
|
| 2008 | 308 |
20.6%
|
|
| 2009 | 369 |
24.7%
|
|
| 2010 | 348 |
23.3%
|
|
| 2011 | 154 |
10.3%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 426 |