| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 1 |
9.1%
|
|
| 2007 | 1 |
9.1%
|
|
| 2008 | 8 |
72.7%
|
|
| 9999 | 1 |
9.1%
|
|
| Sysmiss | 4368 |