| Value | Category | Cases | |
|---|---|---|---|
| 0 | not yet completed | 11 |
35.5%
|
| 2006 | 1 |
3.2%
|
|
| 2007 | 17 |
54.8%
|
|
| 2008 | 2 |
6.5%
|
|
| Sysmiss | 11 |