| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 28 | 23 |
50.3%
|
|
| 2000 | 20 | 18 |
39.1%
|
|
| 2001 | 7 | 4 |
9.4%
|
|
| 2002 | 1 | 1 |
1.3%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 3237 | 3248 |