| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 12 | 7 |
17.5%
|
|
| 1999 | 29 | 25 |
64.4%
|
|
| 2000 | 7 | 5 |
13.9%
|
|
| 2001 | 1 | 1 |
2.6%
|
|
| 2002 | 1 | 1 |
1.5%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 3243 | 3254 |