| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 20 | 14 |
26.8%
|
|
| 1999 | 32 | 30 |
58%
|
|
| 2000 | 12 | 7 |
14.1%
|
|
| 2002 | 1 | 1 |
1.1%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 3228 | 3241 |