| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
1.4%
|
|
| 2002 | 3 |
4.1%
|
|
| 2003 | 7 |
9.6%
|
|
| 2004 | 24 |
32.9%
|
|
| 2005 | 38 |
52.1%
|
|
| 9999 | 9999. Don't know | 0 |
0%
|
| Sysmiss | 926 |