| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
25%
|
|
| 2005 | 2 |
50%
|
|
| 2006 | 1 |
25%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 8440 |