| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 3 |
16.7%
|
|
| 2005 | 6 |
33.3%
|
|
| 2006 | 4 |
22.2%
|
|
| 2007 | 4 |
22.2%
|
|
| 2008 | 1 |
5.6%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 8426 |