| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 126 |
16.7%
|
|
| 2005 | 270 |
35.8%
|
|
| 2006 | 213 |
28.2%
|
|
| 2007 | 111 |
14.7%
|
|
| 2008 | 22 |
2.9%
|
|
| 9997 | Inconsistent | 12 |
1.6%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 7690 |