| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1998 | 4 | 5 |
0.5%
|
|
| 1999 | 121 | 118 |
10.4%
|
|
| 2000 | 162 | 158 |
13.9%
|
|
| 2001 | 288 | 278 |
24.6%
|
|
| 2002 | 393 | 376 |
33.2%
|
|
| 2003 | 209 | 198 |
17.4%
|
|
| 9997 | inconsistent | 0 | 0 |
0%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2116 | 2159 |