| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 198 |
24.2%
|
|
| 2005 | 270 |
33%
|
|
| 2006 | 238 |
29.1%
|
|
| 2007 | 77 |
9.4%
|
|
| 2008 | 18 |
2.2%
|
|
| 9997 | Inconsistent | 17 |
2.1%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 7626 |