| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 8 |
12.3%
|
|
| 2003 | 14 |
21.5%
|
|
| 2004 | 12 |
18.5%
|
|
| 2005 | 27 |
41.5%
|
|
| 2006 | 4 |
6.2%
|
|
| 9998 | DK | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 127 |