| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
3.7%
|
|
| 2001 | 1 |
3.7%
|
|
| 2002 | 1 |
3.7%
|
|
| 2003 | 1 |
3.7%
|
|
| 2004 | 12 |
44.4%
|
|
| 2005 | 11 |
40.7%
|
|
| 9999 | 9999. Don't know | 0 |
0%
|
| Sysmiss | 972 |