| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 37 |
37.4%
|
|
| 2005 | 37 |
37.4%
|
|
| 2006 | 14 |
14.1%
|
|
| 2007 | 5 |
5.1%
|
|
| 2008 | 2 |
2%
|
|
| 9997 | Inconsistent | 4 |
4%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 8345 |