| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 68 |
4.7%
|
|
| 2007 | 227 |
15.6%
|
|
| 2008 | 301 |
20.7%
|
|
| 2009 | 360 |
24.7%
|
|
| 2010 | 345 |
23.7%
|
|
| 2011 | 156 |
10.7%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 465 |