| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 76 |
5.9%
|
|
| 2007 | 198 |
15.3%
|
|
| 2008 | 266 |
20.6%
|
|
| 2009 | 307 |
23.8%
|
|
| 2010 | 307 |
23.8%
|
|
| 2011 | 137 |
10.6%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 631 |