| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 68 |
35.4%
|
|
| 2001 | 72 |
37.5%
|
|
| 2002 | 38 |
19.8%
|
|
| 2003 | 11 |
5.7%
|
|
| 2004 | 3 |
1.6%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 29880 |