| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
14.3%
|
|
| 2003 | 1 |
14.3%
|
|
| 2004 | 1 |
14.3%
|
|
| 2005 | 2 |
28.6%
|
|
| 9999 | 9999. Don't know | 2 |
28.6%
|
| Sysmiss | 992 |