| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 121 |
1.6%
|
|
| 2005 | 642 |
8.6%
|
|
| 2006 | 725 |
9.7%
|
|
| 2007 | 794 |
10.6%
|
|
| 2008 | 863 |
11.5%
|
|
| 2009 | 348 |
4.6%
|
|
| 9998 | dk | 9 |
0.1%
|
| 9999 | missing | 1287 |
17.2%
|
| Sysmiss | 2710 |
36.1%
|