| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 76 |
1%
|
|
| 2005 | 657 |
8.8%
|
|
| 2006 | 797 |
10.6%
|
|
| 2007 | 799 |
10.7%
|
|
| 2008 | 832 |
11.1%
|
|
| 2009 | 297 |
4%
|
|
| 9998 | dk | 9 |
0.1%
|
| 9999 | missing | 1272 |
17%
|
| Sysmiss | 2760 |
36.8%
|