| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 47 | 44 |
9.6%
|
|
| 1999 | 184 | 166 |
35.9%
|
|
| 2000 | 170 | 150 |
32.5%
|
|
| 2001 | 90 | 80 |
17.3%
|
|
| 2002 | 21 | 20 |
4.3%
|
|
| 2003 | 3 | 2 |
0.5%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2778 | 2831 |