| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 4 |
2.1%
|
|
| 2001 | 5 |
2.7%
|
|
| 2002 | 7 |
3.7%
|
|
| 2003 | 27 |
14.4%
|
|
| 2004 | 81 |
43.3%
|
|
| 2005 | 63 |
33.7%
|
|
| 9999 | 9999. Don't know | 0 |
0%
|
| Sysmiss | 812 |