| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 100 |
7.4%
|
|
| 2007 | 196 |
14.5%
|
|
| 2008 | 297 |
22%
|
|
| 2009 | 319 |
23.6%
|
|
| 2010 | 323 |
23.9%
|
|
| 2011 | 118 |
8.7%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 569 |