| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 41 |
40.6%
|
|
| 2005 | 37 |
36.6%
|
|
| 2006 | 13 |
12.9%
|
|
| 2007 | 5 |
5%
|
|
| 2008 | 2 |
2%
|
|
| 9997 | Inconsistent | 3 |
3%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 8343 |