| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 38 | 38 |
4.1%
|
|
| 1999 | 104 | 94 |
10.2%
|
|
| 2000 | 144 | 143 |
15.6%
|
|
| 2001 | 216 | 219 |
23.9%
|
|
| 2002 | 316 | 291 |
31.8%
|
|
| 2003 | 145 | 131 |
14.4%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2330 | 2377 |