| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 3 |
10.7%
|
|
| 2002 | 2 |
7.1%
|
|
| 2003 | 7 |
25%
|
|
| 2004 | 11 |
39.3%
|
|
| 2005 | 5 |
17.9%
|
|
| 9999 | 9999. Don't know | 0 |
0%
|
| Sysmiss | 71 |