| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
16.7%
|
|
| 2005 | 2 |
33.3%
|
|
| 2006 | 3 |
50%
|
|
| 9999 | 9999. Don't know | 0 |
0%
|
| Sysmiss | 93 |