| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 14 |
21.2%
|
| 2006 | 1 |
1.5%
|
|
| 2007 | 1 |
1.5%
|
|
| 2009 | 2 |
3%
|
|
| 9888 | Continuing | 48 |
72.7%
|
| Sysmiss | 120 |