| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 1 |
2.1%
|
|
| 2004 | 1 |
2.1%
|
|
| 2005 | 19 |
40.4%
|
|
| 2006 | 25 |
53.2%
|
|
| 9999 | 9999. Don't know | 1 |
2.1%
|
| Sysmiss | 952 |