| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 115 |
8%
|
|
| 2007 | 216 |
15.1%
|
|
| 2008 | 314 |
22%
|
|
| 2009 | 341 |
23.8%
|
|
| 2010 | 334 |
23.4%
|
|
| 2011 | 110 |
7.7%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 492 |