| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 14 |
0.3%
|
|
| 2007 | 152 |
3.8%
|
|
| 2008 | 389 |
9.6%
|
|
| 2009 | 779 |
19.2%
|
|
| 2010 | 1259 |
31.1%
|
|
| 2011 | 1436 |
35.4%
|
|
| 9998 | DK | 23 |
0.6%
|
| Sysmiss | 3574 |