| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 3 | 1 |
1.7%
|
|
| 1999 | 36 | 31 |
63%
|
|
| 2000 | 15 | 12 |
23.4%
|
|
| 2001 | 6 | 5 |
10.8%
|
|
| 2002 | 1 | 1 |
1.2%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 3232 | 3244 |