| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
12.5%
|
|
| 2003 | 1 |
12.5%
|
|
| 2004 | 2 |
25%
|
|
| 2005 | 4 |
50%
|
|
| 9999 | 9999. Don't know | 0 |
0%
|
| Sysmiss | 991 |